This document summarizes recent developments in organic solar cell technology. It discusses how organic solar cells work by generating electron-hole pairs called excitons when light is absorbed. Excitons must dissociate at donor-acceptor interfaces to generate free charges. There is ongoing research to better understand the mechanism of exciton dissociation. Computational methods like time-dependent density functional theory are being used to simulate charge transfer processes. Experimental research focuses on spectroscopic analysis to study conversion processes in picosecond timescales. Recent efficiency improvements and new device architectures are driving the commercial potential of organic solar cells.
The document discusses organic semiconductors and their operation in organic solar cells. It describes how organic materials can act as conductors when their molecular structure forms alternating single and double bonds. The source of free electrons in these materials is pi bonds between carbon atoms. When light is absorbed in the materials, excitons are formed which are electron-hole pairs. At the interface between an organic donor material and an organic acceptor material in a solar cell, the excitons can dissociate into free charge carriers. However, the charges remain bound as polarons which need to be separated by an external voltage before being transported to the electrodes.
1. Organic photovoltaic (OPV) solar cells aim to provide an abundant and low-cost photovoltaic solution compared to classical silicon solar cells.
2. OPV cells work by absorbing light which creates an exciton, an electron-hole pair, that is separated at the donor-acceptor interface.
3. The three main types of OPV cells are single layer, bilayer, and bulk heterojunction, with bulk heterojunction having the highest efficiencies due to an intermixed donor-acceptor layer.
This document discusses active layer materials used in organic solar cells. It begins by introducing organic photovoltaic cells and their bulk heterojunction architecture, which consists of a blend of electron donor and acceptor materials. The key properties of donor and acceptor materials that influence photovoltaic performance are then described, including absorption spectrum, molecular energy levels, charge mobility, and material properties like solubility. Common donor materials like P3HT, MEH-PPV, and MDMO-PPV are introduced along with the acceptor material PCBM. Controlling the band gap and molecular energy levels of materials through molecular design is discussed as important for optimizing photovoltaic performance.
Organic Solar cells are the future.They can be easily manufactured. also flexible; can be carried around in pockets, and 1000 times thinner to silicon cells.
This document discusses polymeric materials used in organic solar cells. It explains that organic solar cells use organic polymers and small molecules to absorb light and transport charges. Common donor polymers mentioned include phthalocyanine and poly(3-hexylthiophene), while acceptor examples provided are perylene, perylene-3,4,9,10-tetracarboxylic dianhydride, phenyl-C61-butyric acid methyl ester, and buckminsterfullerene. The document outlines the charge transfer process in organic solar cells and advantages of using polymeric materials, such as low cost and flexibility. Hazards and properties are also noted for some mentioned materials.
Organic solar cells offer several advantages over traditional silicon-based solar cells including lower manufacturing costs due to easier processing of organic molecules, mechanical flexibility, and potential for large-scale production. They consist of a donor material like a polymer and an acceptor material like fullerene arranged in a bulk heterojunction to separate photo-generated electrons and holes. While organic solar cells are not as efficient as silicon cells today, their lower costs and flexibility make them a promising renewable energy technology.
in this work you will fond a full discription of the technologie of the organic solar cells:
we distanguish 3 types of organic solar cells
sigel layer organic pv
bi-layer hyterojunction solar cells
bulk hyterojunction solar cells
you will fond the adventeges and the desadventeges of eatch one of them
some application of the organic solar cells
This document discusses organic solar cells, which convert light to electricity using conjugated polymers and molecules rather than traditional silicon materials. It provides background on the need for alternative energy sources due to growing energy demand and limited fossil fuels. Organic solar cells absorb light, transfer charges, transport the separated charges, and collect them. Researchers have achieved a new record efficiency of 15.6% for a graphene-based solar cell that uses titanium oxide, graphene, and perovskite, manufactured via low-temperature solution deposition. While organic solar cells offer advantages like lower costs and flexibility, their efficiency remains below silicon cells and they suffer from degradation. Further improving charge carrier transport and interface engineering is needed to enhance performance.
The document discusses organic semiconductors and their operation in organic solar cells. It describes how organic materials can act as conductors when their molecular structure forms alternating single and double bonds. The source of free electrons in these materials is pi bonds between carbon atoms. When light is absorbed in the materials, excitons are formed which are electron-hole pairs. At the interface between an organic donor material and an organic acceptor material in a solar cell, the excitons can dissociate into free charge carriers. However, the charges remain bound as polarons which need to be separated by an external voltage before being transported to the electrodes.
1. Organic photovoltaic (OPV) solar cells aim to provide an abundant and low-cost photovoltaic solution compared to classical silicon solar cells.
2. OPV cells work by absorbing light which creates an exciton, an electron-hole pair, that is separated at the donor-acceptor interface.
3. The three main types of OPV cells are single layer, bilayer, and bulk heterojunction, with bulk heterojunction having the highest efficiencies due to an intermixed donor-acceptor layer.
This document discusses active layer materials used in organic solar cells. It begins by introducing organic photovoltaic cells and their bulk heterojunction architecture, which consists of a blend of electron donor and acceptor materials. The key properties of donor and acceptor materials that influence photovoltaic performance are then described, including absorption spectrum, molecular energy levels, charge mobility, and material properties like solubility. Common donor materials like P3HT, MEH-PPV, and MDMO-PPV are introduced along with the acceptor material PCBM. Controlling the band gap and molecular energy levels of materials through molecular design is discussed as important for optimizing photovoltaic performance.
Organic Solar cells are the future.They can be easily manufactured. also flexible; can be carried around in pockets, and 1000 times thinner to silicon cells.
This document discusses polymeric materials used in organic solar cells. It explains that organic solar cells use organic polymers and small molecules to absorb light and transport charges. Common donor polymers mentioned include phthalocyanine and poly(3-hexylthiophene), while acceptor examples provided are perylene, perylene-3,4,9,10-tetracarboxylic dianhydride, phenyl-C61-butyric acid methyl ester, and buckminsterfullerene. The document outlines the charge transfer process in organic solar cells and advantages of using polymeric materials, such as low cost and flexibility. Hazards and properties are also noted for some mentioned materials.
Organic solar cells offer several advantages over traditional silicon-based solar cells including lower manufacturing costs due to easier processing of organic molecules, mechanical flexibility, and potential for large-scale production. They consist of a donor material like a polymer and an acceptor material like fullerene arranged in a bulk heterojunction to separate photo-generated electrons and holes. While organic solar cells are not as efficient as silicon cells today, their lower costs and flexibility make them a promising renewable energy technology.
in this work you will fond a full discription of the technologie of the organic solar cells:
we distanguish 3 types of organic solar cells
sigel layer organic pv
bi-layer hyterojunction solar cells
bulk hyterojunction solar cells
you will fond the adventeges and the desadventeges of eatch one of them
some application of the organic solar cells
This document discusses organic solar cells, which convert light to electricity using conjugated polymers and molecules rather than traditional silicon materials. It provides background on the need for alternative energy sources due to growing energy demand and limited fossil fuels. Organic solar cells absorb light, transfer charges, transport the separated charges, and collect them. Researchers have achieved a new record efficiency of 15.6% for a graphene-based solar cell that uses titanium oxide, graphene, and perovskite, manufactured via low-temperature solution deposition. While organic solar cells offer advantages like lower costs and flexibility, their efficiency remains below silicon cells and they suffer from degradation. Further improving charge carrier transport and interface engineering is needed to enhance performance.
Organic solar cells are a type of photovoltaic cell that uses conductive organic polymers or small organic molecules to absorb light and transport charges. They typically consist of two semiconducting layers made of polymers or other flexible materials. When light is absorbed, an exciton is generated which splits into an electron and hole. The electron then moves to one layer while the hole moves to the other, generating electricity. Common organic materials used in these cells include polymers like P3HT, small molecules like PCBM, and various conducting and semiconducting organic compounds.
Organic photovoltaic cells use organic polymers or small organic molecules to convert sunlight into electricity through the photovoltaic effect. They have several advantages over traditional silicon solar cells, including flexibility, low production costs, and being Earth-abundant. However, their efficiency is generally lower. There are several types of organic solar cell structures, including single layer, bilayer, and bulk heterojunction, with bulk heterojunction being the most commonly used today. Organic photovoltaic cells show promise for applications like building integration and consumer electronics.
The document discusses organic solar cells, which use organic electronics to produce electricity from sunlight. Organic solar cells work by absorbing light to generate excitons, dissociating the excitons into free charges at donor-acceptor interfaces, and transporting the charges through organic semiconductors. The document outlines the basic principles of light absorption, exciton diffusion, exciton dissociation, and charge transport in organic solar cells. It also describes how organic solar cells are characterized by parameters such as power conversion efficiency, open circuit voltage, short circuit current, and fill factor.
This document discusses organic solar cells as a more efficient and flexible alternative to traditional silicon solar cells. Organic solar cells are constructed using a hybrid of cadmium selenide nano-rods dispersed in an organic polymer layer sandwiched between electrodes. The nano-rods absorb sunlight and produce electron-hole pairs, which are conducted through the polymer layer to the electrodes to generate electricity. Organic solar cells have advantages over traditional cells in that they are more efficient, compact, lightweight, flexible, inexpensive to produce, and can harness invisible light. However, they currently have shorter lifespans and require more maintenance than conventional cells.
This document summarizes a presentation on organic photovoltaic solar cells. It discusses how organic solar cells use a bulk heterojunction of p-type and n-type organic polymers to generate electricity from light absorption. Calculations show thinner polymer layers could optimize light absorption through a cavity effect. The presenter's goal is to verify experimentally that thinner polymer layers in different electrode configurations can absorb as much light as thicker layers. Preliminary results with commercial ITO, polymer and silver layers show agreement with calculations for a 66.1nm thick polymer layer. Further work will optimize materials and structures to improve efficiencies and enable mass production of organic solar cells.
Organic solar cells have evolved from single layer cells with efficiencies of 0.1% to bulk heterojunction cells that can achieve 10% efficiency. They offer advantages like low-cost deposition techniques, flexibility, and semitransparency but have limitations such as low charge carrier mobility. Future areas of focus include developing tandem cells, incorporating plasmonic structures to enhance light absorption, and exploring ternary blends and cascade charge transfer mechanisms to overcome limitations. With continued advances, organic solar cells show promise to provide a high efficiency, low-cost alternative to traditional silicon photovoltaics.
Multi-junction solar cells use multiple semiconductor materials with different bandgaps stacked together to absorb a wider range of the solar spectrum and achieve higher efficiencies than single-material solar cells. They are fabricated using techniques like metalorganic vapor phase epitaxy and molecular beam epitaxy to precisely control the growth of each layer for optimal bandgap and lattice matching. Current multi-junction cells can achieve efficiencies over 40% and are used in space applications, though high costs have limited terrestrial use primarily to concentrated photovoltaics. Further efficiency improvements may come from new materials like quantum dots, optimizing existing layer designs, and increasing the number of junctions to finer divide the solar spectrum.
Here are the answers to your questions:
1. P-type semiconductors have extra holes which act as positive charge carriers. N-type semiconductors have extra free electrons which act as negative charge carriers.
2. In a solar cell, photons from sunlight knock electrons loose from the semiconductor material (e.g. silicon). This creates an imbalance between the n-type and p-type materials. The p-n junction acts like a diode, allowing the electrons to flow in one direction through an external circuit producing a current.
3. An inverter is important because photovoltaic cells produce direct current (DC) electricity but buildings use alternating current (AC). The inverter changes the DC
This document provides an overview of organic solar cells. It discusses that organic solar cells are more economical and flexible than traditional silicon solar cells. The structure of organic solar cells is described, including the light-absorbing donor polymer layer, the electron-acceptor fullerene layer, and electrodes. Applications mentioned include phone chargers, small electronics, and building-integrated photovoltaics. Manufacturing of organic solar cells has lower costs than silicon cells due to using thinner films of molecules. While organic solar cells have disadvantages like lower efficiency and shorter lifetimes than silicon, they provide benefits such as flexibility, low weight, and reduced environmental impact.
In this Presentation on solar cell is most effect for student of class 12
Contents:
Introduction to Solar Cells .
* The working principal of a solar cell .
* Types of solar cells.
* Working and construction.
* Benefit and disadvantages.
* application.
* Summary.
An organic solar cell or plastic solar cell is a type of photovoltaic that uses organic electronics, a branch of electronics that deals with conductive organic polymers or small organic molecules, for light absorption and charge transport to produce electricity from sunlight by the photovoltaic effect. Most organic photovoltaic cells are polymer solar cells.
Display technology is on demand with so many devices in the market. With constant operation of the device, the battery duration is limited. When organic solar cells are integrated with the display (organic LED), it serves as a dual purpose - decreasing light reflection (which otherwise would degrade contrast) and energy recycling (making using of the excess photons emitted from the display).
This document provides information on a project to develop polymer:fullerene solar cells. The objectives are to study how device characteristics like thickness, absorbance, and power conversion efficiency (PCE) relate to fabrication parameters like spin speed. Characterization tools like atomic force microscopy, UV-visible spectroscopy, and a solar simulator will be used. Challenges include material sensitivity to moisture and limited fullerene supply. The device uses a layered structure of ITO/PEDOT:PSS/MEH-PPV:PCBM/TiO2 with the active layer deposited at different spin speeds for analysis.
Triple junction based high efficiency tandem solar cellsPritam Rath
Triple junction tandem solar cells have very high efficiencies of up to 60% for satellites and 85% in the lab. This is much higher than conventional silicon solar cells that are only around 20% efficient. However, the high cost of $2.48/cm2 currently limits their commercial use to space applications, and research is ongoing to reduce the price. The cells work by using three different semiconductor materials stacked together to convert more of the solar spectrum into electricity compared to single material cells.
(1) The document discusses the design of an efficient third generation photovoltaic system using a tandem junction approach.
(2) Tandem junction solar cells aim to circumvent the Shockley-Queisser limit for single junction cells by using multiple semiconductor materials with different bandgaps stacked in series.
(3) Key considerations for the design of an optimal tandem junction include the selection of materials that allow for series connection while matching bandgaps and lattice structures, as well as choices around concentration levels and optical configuration.
The document discusses flexible organic solar cells. It outlines their construction, which involves depositing an electron donor and acceptor layer on a flexible material using chemical vapor deposition. It explains how these solar cells work by absorbing light which promotes electrons in the donor layer to the LUMO level, allowing them to be transferred to the acceptor layer and collected at electrodes. Flexible organic solar cells are advantageous because they can be made thin, lightweight and flexible on materials like plastic or paper, making them portable and low-cost to manufacture using vapor deposition. The conclusion states that flexible organic solar cells have greater efficiency and performance than traditional rigid solar panels due to their physical structure.
1) The document describes a Monte Carlo model developed to simulate exciton diffusion in organic solar cells containing different porphyrin compounds.
2) The model simulated the diffusion and decay of excitons in a cube representing the solar cell material. Results showed less aggregation of PCBM molecules and longer exciton lifetimes for the compound TCO4PP compared to TCM4PP.
3) By varying the simulation parameters, the model determined TCO4PP had significantly longer exciton diffusion lengths than TCM4PP, indicating it could enable up to two times higher efficiencies in organic solar cells.
This document describes an infrared plastic solar cell that uses cadmium selenide (CdSe) nanorods dispersed in a poly(3-hexylthiophene) (P3HT) polymer semiconductor. The nanorods are 7nm in diameter and 60nm in length and are synthesized in a solution containing CdSe. This nanocomposite absorbs infrared light and converts it to electricity. When light is absorbed, electrons are generated and transferred to the aluminum electrode while holes move to the electrode through the plastic, creating a current. This solar cell has advantages over traditional silicon cells in that plastic is cheaper to produce, it can absorb different wavelengths of light, and it can still function on cloudy days. However, it also has limitations
This document discusses using rapid prototyping as a design method in engineering education from a CAD customization perspective. It describes a project where students designed a modular holder for organic solar cells using a rapid prototyping approach. The students went through an iterative design process of prototyping, testing, and redesigning their models. The document concludes that this rapid prototyping as design method was effective for improving students' technical design skills while allowing them to explore problems heuristically and converge on a solution. It also helped students develop metacognitive reflection abilities.
Organic Photovoltaic Solar Cell Technology StrategyJimmy Pan
Technology strategy report focused on organic photovoltaic (OPV) technology, which is the third generation of solar cell technology, being developed by Solarmer Energy, Inc. Contains analysis of topics including macroeconomic environment, competitive environment, product strategy, project valuation and financing, and implementation plan.
Organic solar cells are a type of photovoltaic cell that uses conductive organic polymers or small organic molecules to absorb light and transport charges. They typically consist of two semiconducting layers made of polymers or other flexible materials. When light is absorbed, an exciton is generated which splits into an electron and hole. The electron then moves to one layer while the hole moves to the other, generating electricity. Common organic materials used in these cells include polymers like P3HT, small molecules like PCBM, and various conducting and semiconducting organic compounds.
Organic photovoltaic cells use organic polymers or small organic molecules to convert sunlight into electricity through the photovoltaic effect. They have several advantages over traditional silicon solar cells, including flexibility, low production costs, and being Earth-abundant. However, their efficiency is generally lower. There are several types of organic solar cell structures, including single layer, bilayer, and bulk heterojunction, with bulk heterojunction being the most commonly used today. Organic photovoltaic cells show promise for applications like building integration and consumer electronics.
The document discusses organic solar cells, which use organic electronics to produce electricity from sunlight. Organic solar cells work by absorbing light to generate excitons, dissociating the excitons into free charges at donor-acceptor interfaces, and transporting the charges through organic semiconductors. The document outlines the basic principles of light absorption, exciton diffusion, exciton dissociation, and charge transport in organic solar cells. It also describes how organic solar cells are characterized by parameters such as power conversion efficiency, open circuit voltage, short circuit current, and fill factor.
This document discusses organic solar cells as a more efficient and flexible alternative to traditional silicon solar cells. Organic solar cells are constructed using a hybrid of cadmium selenide nano-rods dispersed in an organic polymer layer sandwiched between electrodes. The nano-rods absorb sunlight and produce electron-hole pairs, which are conducted through the polymer layer to the electrodes to generate electricity. Organic solar cells have advantages over traditional cells in that they are more efficient, compact, lightweight, flexible, inexpensive to produce, and can harness invisible light. However, they currently have shorter lifespans and require more maintenance than conventional cells.
This document summarizes a presentation on organic photovoltaic solar cells. It discusses how organic solar cells use a bulk heterojunction of p-type and n-type organic polymers to generate electricity from light absorption. Calculations show thinner polymer layers could optimize light absorption through a cavity effect. The presenter's goal is to verify experimentally that thinner polymer layers in different electrode configurations can absorb as much light as thicker layers. Preliminary results with commercial ITO, polymer and silver layers show agreement with calculations for a 66.1nm thick polymer layer. Further work will optimize materials and structures to improve efficiencies and enable mass production of organic solar cells.
Organic solar cells have evolved from single layer cells with efficiencies of 0.1% to bulk heterojunction cells that can achieve 10% efficiency. They offer advantages like low-cost deposition techniques, flexibility, and semitransparency but have limitations such as low charge carrier mobility. Future areas of focus include developing tandem cells, incorporating plasmonic structures to enhance light absorption, and exploring ternary blends and cascade charge transfer mechanisms to overcome limitations. With continued advances, organic solar cells show promise to provide a high efficiency, low-cost alternative to traditional silicon photovoltaics.
Multi-junction solar cells use multiple semiconductor materials with different bandgaps stacked together to absorb a wider range of the solar spectrum and achieve higher efficiencies than single-material solar cells. They are fabricated using techniques like metalorganic vapor phase epitaxy and molecular beam epitaxy to precisely control the growth of each layer for optimal bandgap and lattice matching. Current multi-junction cells can achieve efficiencies over 40% and are used in space applications, though high costs have limited terrestrial use primarily to concentrated photovoltaics. Further efficiency improvements may come from new materials like quantum dots, optimizing existing layer designs, and increasing the number of junctions to finer divide the solar spectrum.
Here are the answers to your questions:
1. P-type semiconductors have extra holes which act as positive charge carriers. N-type semiconductors have extra free electrons which act as negative charge carriers.
2. In a solar cell, photons from sunlight knock electrons loose from the semiconductor material (e.g. silicon). This creates an imbalance between the n-type and p-type materials. The p-n junction acts like a diode, allowing the electrons to flow in one direction through an external circuit producing a current.
3. An inverter is important because photovoltaic cells produce direct current (DC) electricity but buildings use alternating current (AC). The inverter changes the DC
This document provides an overview of organic solar cells. It discusses that organic solar cells are more economical and flexible than traditional silicon solar cells. The structure of organic solar cells is described, including the light-absorbing donor polymer layer, the electron-acceptor fullerene layer, and electrodes. Applications mentioned include phone chargers, small electronics, and building-integrated photovoltaics. Manufacturing of organic solar cells has lower costs than silicon cells due to using thinner films of molecules. While organic solar cells have disadvantages like lower efficiency and shorter lifetimes than silicon, they provide benefits such as flexibility, low weight, and reduced environmental impact.
In this Presentation on solar cell is most effect for student of class 12
Contents:
Introduction to Solar Cells .
* The working principal of a solar cell .
* Types of solar cells.
* Working and construction.
* Benefit and disadvantages.
* application.
* Summary.
An organic solar cell or plastic solar cell is a type of photovoltaic that uses organic electronics, a branch of electronics that deals with conductive organic polymers or small organic molecules, for light absorption and charge transport to produce electricity from sunlight by the photovoltaic effect. Most organic photovoltaic cells are polymer solar cells.
Display technology is on demand with so many devices in the market. With constant operation of the device, the battery duration is limited. When organic solar cells are integrated with the display (organic LED), it serves as a dual purpose - decreasing light reflection (which otherwise would degrade contrast) and energy recycling (making using of the excess photons emitted from the display).
This document provides information on a project to develop polymer:fullerene solar cells. The objectives are to study how device characteristics like thickness, absorbance, and power conversion efficiency (PCE) relate to fabrication parameters like spin speed. Characterization tools like atomic force microscopy, UV-visible spectroscopy, and a solar simulator will be used. Challenges include material sensitivity to moisture and limited fullerene supply. The device uses a layered structure of ITO/PEDOT:PSS/MEH-PPV:PCBM/TiO2 with the active layer deposited at different spin speeds for analysis.
Triple junction based high efficiency tandem solar cellsPritam Rath
Triple junction tandem solar cells have very high efficiencies of up to 60% for satellites and 85% in the lab. This is much higher than conventional silicon solar cells that are only around 20% efficient. However, the high cost of $2.48/cm2 currently limits their commercial use to space applications, and research is ongoing to reduce the price. The cells work by using three different semiconductor materials stacked together to convert more of the solar spectrum into electricity compared to single material cells.
(1) The document discusses the design of an efficient third generation photovoltaic system using a tandem junction approach.
(2) Tandem junction solar cells aim to circumvent the Shockley-Queisser limit for single junction cells by using multiple semiconductor materials with different bandgaps stacked in series.
(3) Key considerations for the design of an optimal tandem junction include the selection of materials that allow for series connection while matching bandgaps and lattice structures, as well as choices around concentration levels and optical configuration.
The document discusses flexible organic solar cells. It outlines their construction, which involves depositing an electron donor and acceptor layer on a flexible material using chemical vapor deposition. It explains how these solar cells work by absorbing light which promotes electrons in the donor layer to the LUMO level, allowing them to be transferred to the acceptor layer and collected at electrodes. Flexible organic solar cells are advantageous because they can be made thin, lightweight and flexible on materials like plastic or paper, making them portable and low-cost to manufacture using vapor deposition. The conclusion states that flexible organic solar cells have greater efficiency and performance than traditional rigid solar panels due to their physical structure.
1) The document describes a Monte Carlo model developed to simulate exciton diffusion in organic solar cells containing different porphyrin compounds.
2) The model simulated the diffusion and decay of excitons in a cube representing the solar cell material. Results showed less aggregation of PCBM molecules and longer exciton lifetimes for the compound TCO4PP compared to TCM4PP.
3) By varying the simulation parameters, the model determined TCO4PP had significantly longer exciton diffusion lengths than TCM4PP, indicating it could enable up to two times higher efficiencies in organic solar cells.
This document describes an infrared plastic solar cell that uses cadmium selenide (CdSe) nanorods dispersed in a poly(3-hexylthiophene) (P3HT) polymer semiconductor. The nanorods are 7nm in diameter and 60nm in length and are synthesized in a solution containing CdSe. This nanocomposite absorbs infrared light and converts it to electricity. When light is absorbed, electrons are generated and transferred to the aluminum electrode while holes move to the electrode through the plastic, creating a current. This solar cell has advantages over traditional silicon cells in that plastic is cheaper to produce, it can absorb different wavelengths of light, and it can still function on cloudy days. However, it also has limitations
This document discusses using rapid prototyping as a design method in engineering education from a CAD customization perspective. It describes a project where students designed a modular holder for organic solar cells using a rapid prototyping approach. The students went through an iterative design process of prototyping, testing, and redesigning their models. The document concludes that this rapid prototyping as design method was effective for improving students' technical design skills while allowing them to explore problems heuristically and converge on a solution. It also helped students develop metacognitive reflection abilities.
Organic Photovoltaic Solar Cell Technology StrategyJimmy Pan
Technology strategy report focused on organic photovoltaic (OPV) technology, which is the third generation of solar cell technology, being developed by Solarmer Energy, Inc. Contains analysis of topics including macroeconomic environment, competitive environment, product strategy, project valuation and financing, and implementation plan.
Vishal Shrotriya presented on low cost manufacturing of organic solar cells. He discussed Solarmer's development of roll-to-roll processing for high throughput, low temperature production of organic photovoltaic cells. Through new donor and acceptor materials, efficiencies over 8% have been achieved in single cells and modules. Testing has shown stability of over 2500 hours under continuous illumination. The talk outlined a roadmap for commercializing organic solar cell products, starting with applications in portable power and building integrated photovoltaics, with a potential market of hundreds of millions of dollars annually.
The document summarizes research on using activated carbon derived from Phoenix Dactylifera (Date Palm) seeds to remove fluoride from water. Batch tests were conducted to determine the optimum contact time, adsorbent dosage, and pH for fluoride removal. The maximum removal efficiency of 94.5% was achieved with a contact time of 40 minutes, adsorbent dosage of 140mg, and pH of 7. Activated carbon with higher impregnation ratios during production had higher removal rates. The research demonstrates the effectiveness of using activated carbon from date palm seeds for defluoridation.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Performance analysis of cmos comparator and cntfet comparator designeSAT Publishing House
This document summarizes a study comparing the performance of CNTFET and CMOS comparator designs. CNTFET comparators were simulated using CADENCE showing faster propagation delays, lower power consumption, and improved transient response compared to CMOS comparators. Specifically, the CNTFET comparator had a rise time of 142.1ns versus 1.03ns for CMOS, and fall time of 164.18ns versus 821.476ns for CMOS. Average power was also lower at 118mW for CNTFET versus 910mW for CMOS. Due to these advantages, CNTFETs may replace silicon transistors as the performance of silicon MOSFETs reaches scaling limitations.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Design and implementation of an ancrchitecture of embedded web server for wir...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Analysis of multi hop relay algorithm for efficient broadcasting in manetseSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Scientists are researching organic photovoltaic cells as a cheaper alternative energy source to traditional silicon solar cells. Organic cells use carbon-based conjugated polymers and molecules that can be easily processed and are flexible. Various architectures for organic solar cells have been investigated, including single layer cells, bilayer cells with donor and acceptor materials, and bulk heterojunction cells with the donor and acceptor mixed together. Researchers aim to increase the power conversion efficiency of polymer-fullerene bulk heterojunction solar cells to 8-10% through improved materials and device design.
Scientists are researching organic photovoltaic cells as a cheaper alternative energy source to traditional silicon solar cells. Organic cells use carbon-based conjugated polymers and molecules that can be easily processed and are flexible. Various architectures for organic solar cells have been investigated, including single layer cells, bilayer cells with donor and acceptor materials, and bulk heterojunction cells with the donor and acceptor mixed together. Researchers aim to increase the power conversion efficiency of polymer-fullerene bulk heterojunction solar cells to 8-10% through improved materials and device design.
The electrical and environmental parameters of polymer solar cells (PSC) provide important information on their performance. In the present article we study the influence of temperature on the voltage-current (I-V) characteristic at different temperatures from 10 °C to 90 °C, and important parameters like bandgap energy Eg, and the energy conversion efficiency η. The one-diode electrical model, normally used for semiconductor cells, has been tested and validated for the polemeral junction. The PSC used in our study are formed by the poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM). Our technique is based on the combination of two steps; the first use the Least Mean Squares (LMS) method while the second use the Newton-Raphson algorithm. The found results are compared to other recently published works, they show that the developed approach is very accurate. This precision is proved by the minimal values of statistical errors (RMSE) and the good agreement between both the experimental data and the I-V simulated curves. The obtained results show a clear and a monotonic dependence of the cell efficiency on the studied parameters.
Organic solar cells the exciting interplay of excitons and nano-morphologyvvgk-thalluri
1) The document summarizes organic solar cells, which use a bulk heterojunction of a conjugated polymer donor and fullerene acceptor. When light is absorbed, excitons are formed that must dissociate at the donor-acceptor interface into free charges.
2) The bulk heterojunction morphology, consisting of an interpenetrating network of the donor and acceptor materials, allows more excitons to dissociate since the interface is throughout the volume. This leads to higher efficiencies than simple bilayer cells.
3) Efficiencies of over 6% have been achieved but further work is needed to improve stability and lower costs for organic solar cells to become commercially viable. Optimization of
2010_NanoToday_Controlling nanoscale morphology in polymer photovoltaic devicesXimin He
The document discusses controlling nanoscale morphology in polymer photovoltaic devices. It highlights the importance of morphological design and control for achieving high efficiency in polymer photovoltaics. The morphology affects key aspects of the photovoltaic process like light absorption, exciton diffusion to the donor-acceptor interface, and charge transfer and collection. Controlling the domain sizes and interface between donor and acceptor components to be on the scale of the exciton diffusion length (around 10 nm) allows for efficient exciton dissociation. The molecular packing and ordering at the interface also influences charge separation and recombination. Overall morphological design is crucial for optimizing the various steps in the photovoltaic process to improve device performance.
Exploiting the potential of 2-((5-(4-(diphenylamino)- phenyl)thiophen-2-yl)me...Akinola Oyedele
A comprehensive experimental study is reported on the optical and electrical characteristics of 2-((5-(4-
(diphenylamino)phenyl)thiophen-2-yl)methylene)malononitrile (DPTMM) when used as molecular donor
in an organic solar cell (OSC) device structure.
Detection Methods That Use Signal Processing And Interfere...Claudia Brown
This document discusses fault detection methods for photovoltaic (PV) array systems. It begins with an abstract stating that PV power generation is an important research area due to high renewable energy demand. More research is needed to detect faults in PV arrays and systems to improve performance and availability. The paper then analyzes various fault detection methods that use signal processing and interfere with PV array analysis techniques. Finally, the conclusion discusses fault detection methods that use signal processing techniques.
Piezoelectric photothermal (PPT) spectroscopy is used to investigate non-radiative recombination processes in solar cells that result in heat loss. A piezoelectric transducer attached to the back of the solar cell detects thermal waves produced by these processes. The experimental setup isolates the sample to precisely measure the phonons generated. Previous studies using PPT spectroscopy provided insights into carrier recombination mechanisms, but silicon solar cells have not been thoroughly examined. This research aims to use PPT spectroscopy to quantitatively measure heat loss and qualitatively analyze where and how it occurs within silicon solar cells.
This document summarizes a presentation on using carbon nanotubes in solar panel technology. It discusses how carbon nanotubes can improve the efficiency of solar cells compared to traditional organic solar cells. Carbon nanotubes are classified as single-walled or multi-walled nanotubes. Carbon nanotubes and a polymer called MEH-PPV-CN are used as materials in constructing a carbon solar cell. The cell works by generating electrons when exposed to light, which are transferred between energy bands and build up voltage. Adding carbon nanotubes can increase the cell's efficiency by improving light absorption and electron transport. Potential applications include using carbon nanotubes in the photoactive layer or as transparent electrodes.
This document summarizes molecular dynamics simulations of radiation damage in zirconia (ZrO2) at energies ranging from 0.1-0.5 MeV. The simulations find that while zirconia is highly resistant to amorphization, there is still a large number of point defects and small defect clusters created by the radiation. However, these defects are isolated from each other, resulting in dilute damage that does not disrupt the long-range crystalline structure. The simulations quantify the number of displacements and defects over time and find that electronic energy losses play an important role in the damage evolution. The findings have implications for using zirconia in nuclear waste storage by suggesting radiation can create many point defects even while
The document summarizes the fabrication, characterization, and performance evaluation of a dye-sensitized solar cell (DSSC). It was submitted as a project report by three students to fulfill their degree requirements in energy engineering at Central University of Jharkhand. The report provides background on DSSCs, describes the experimental methodology used to assemble a DSSC, and presents results and discussion of testing the fabricated DSSC. Key aspects covered include the use of TiO2 semiconductor, ruthenium dye sensitizer, carbon counter electrode, and testing under Ranchi, India weather conditions.
This document discusses in situ irradiated X-ray photoelectron spectroscopy (ISIXPS) and its ability to investigate electron transfer mechanisms in S-scheme photocatalysts. S-scheme photocatalysts have shown promise for solar fuel production. ISIXPS is an effective technique for studying electron transfer pathways in S-scheme heterojunctions, but the mechanism by which it identifies these pathways is not fully understood. This document aims to provide insight into how ISIXPS can be used to confirm interfacial electron transfer and better understand the electron transfer mechanism in S-scheme photocatalysts.
Recent Advances in Photovoltaic Technology based on Perovskite Solar Cell- A ...IRJET Journal
This document provides a review of recent advances in perovskite solar cell technology. Key points include:
- Perovskite solar cells have significantly higher efficiencies than organic solar cells and dye-sensitized solar cells, with efficiencies increasing from 9.6% in 2012 to over 20% in 2015 for lead-based perovskites.
- Perovskites have the formula ABX3 and a specific crystal structure that enables their photovoltaic properties.
- While perovskite solar cells show great potential, issues of stability, toxicity from lead, and degradation with humidity and UV light need further addressing for commercialization.
A Framework For Epbt Calculation Of Roof Mounted...Lindsey Jones
This document discusses photovoltaic (PV) materials used in solar cells. It begins by noting that solar energy is one of the most widely used energy sources and that humans have developed technologies to capture solar energy for applications like cooking, heating, and powering devices. PV cells are then introduced as devices that convert solar energy into electrical energy. The essay aims to discuss PV materials and drive down production costs to make solar energy more affordable and widespread. Lowering costs is important as solar energy is a renewable source that could become a primary source of electricity.
The impact of coloured filters on the performance of polycrystalline photovo...IJECEIAES
Photovoltaic modules behave extraordinarily by transforming part of the visible spectrum into electrical energy, and their efficiencies are affected by the nature of radiation (light) reaching them. When light strikes a photovoltaic cell, this light may go through the cell without been absorbed if it is too energetic or if the light possesses low energy it will be absorbed by the cell and cause the electrons to twist and vibrate in their bonds without dislodging them, hence causing the cell to heat up which ultimately leads to a decrease in its overall efficiency. This study is aimed to investigate how photovoltaics respond to different wavelengths of light. For the study to achieve its aim, colour filters were used to ensure that only a particular wavelength of light reaches the photovoltaic module at a time. In the process of collecting data from the solar panel, the solar panel was placed horizontally flat on a platform one meter above sea level facing the sun. Data was first obtained from the solar panel without the filters and after that with the filters placed one at a time and data collected accordingly. The amount of solar power and solar flux anytime a different colour filter was placed on the solar panel were measured. Among the coloured filter used yellow produced the highest efficiency, while blue produced the least efficiency. However, the solar panel was still more efficient when exposed to the natural spectrum.
Hybrid solar photovoltaic and thermoelectric generators combine photovoltaic cells that convert light into electricity and thermoelectric materials that convert heat into electricity. This allows the system to utilize both the light and thermal energy from the sun across a wider spectrum than either could alone. The review discusses the concepts behind photovoltaics and thermoelectrics. It summarizes recent research that has optimized hybrid systems through various approaches. Improved results from these hybrid generators encourage further research and development to potentially increase their efficiency and practical applications.
Self-assembly techniques can be used to construct nanostructures for photovoltaic devices in a cheaper and faster way compared to traditional fabrication methods. The document discusses how self-assembly of porphyrin and fullerene molecules on metal oxide electrodes leads to the formation of clusters that absorb light effectively across the visible spectrum. It also describes how coating aligned ZnO nanorods with TiO2 using atomic layer deposition creates a two-dimensional photonic crystal for enhanced light harvesting in dye-sensitized solar cells. Overall, the document outlines the potential of self-assembly methods to organize functional organic and inorganic materials into nanostructures that improve the performance of organic and perovskite photovoltaics.
This presentation summarizes organic electronics and compares them to inorganic electronics. Organic electronics uses carbon-based conductive polymers while inorganic relies on materials like silicon and copper. The presentation discusses the electronic properties of both, noting that organic electronics have lower mobility but more synthetic flexibility. Various organic electronic devices are presented, including OLEDs, organic transistors, and organic thin film transistors. Applications of organic electronics with graphene are discussed, and it is concluded that organic electronics could play a key role in flexible electronics and address e-waste issues due to their biodegradability.
This document discusses interface engineering strategies for high-performance organic field-effect transistors (OFETs). It highlights the importance of optimizing the interfaces between different functional components in OFETs, such as the dielectric/semiconductor interface and source/drain electrode/semiconductor interface, in order to improve device performance. The document outlines some key requirements for the different components, including having large grain sizes and few grain boundaries in the organic semiconductor layer, controlling molecular ordering and orientation, using gate dielectrics with high capacitance and low charge traps, and optimizing the electrode/semiconductor interface to facilitate efficient charge injection. Interface engineering approaches that meet these requirements are necessary to fabricate high-performance OFETs.
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Hudhud cyclone caused extensive damage in Visakhapatnam, India in October 2014, especially to tree cover. This will likely impact the local environment in several ways: increased air pollution as trees absorb less; higher temperatures without tree canopy; increased erosion and landslides. It also created large amounts of waste from destroyed trees. Proper management of solid waste is needed to prevent disease spread. Suggested measures include restoring damaged plants, building fountains to reduce heat, mandating light-colored buildings, improving waste management, and educating public on health risks. Overall, changes are needed to water, land, and waste practices to rebuild the environment after the cyclone removed green cover.
Impact of flood disaster in a drought prone area – case study of alampur vill...eSAT Publishing House
1) In September-October 2009, unprecedented heavy rainfall and dam releases caused widespread flooding in Alampur village in Mahabub Nagar district, a historically drought-prone area.
2) The flood damaged or destroyed homes, buildings, infrastructure, crops, and documents. It displaced many residents and cut off the village.
3) The socioeconomic conditions and mud-based construction of homes in the village exacerbated the flood's impacts, making damage more severe and recovery more difficult.
The document summarizes the Hudhud cyclone that struck Visakhapatnam, India in October 2014. It describes the cyclone's formation, rapid intensification to winds of 175 km/h, and landfall near Visakhapatnam. The cyclone caused extensive damage estimated at over $1 billion and at least 109 deaths in India and Nepal. Infrastructure like buildings, bridges, and power lines were destroyed. Crops and fishing boats were also damaged. The document then discusses coping strategies and improvements needed to disaster management plans to better prepare for future cyclones.
Groundwater investigation using geophysical methods a case study of pydibhim...eSAT Publishing House
This document summarizes the results of a geophysical investigation using vertical electrical sounding (VES) methods at 13 locations around an industrial area in India. The VES data was interpreted to generate geo-electric sections and pseudo-sections showing subsurface resistivity variations. Three main layers were typically identified - a high resistivity topsoil, a weathered middle layer, and a basement rock. Pseudo-sections revealed relatively more weathered areas in the northwest and southwest. Resistivity sections helped identify zones of possible high groundwater potential based on low resistivity anomalies sandwiched between more resistive layers. The study concluded the electrical resistivity method was useful for understanding subsurface geology and identifying areas prospective for groundwater exploration.
Flood related disasters concerned to urban flooding in bangalore, indiaeSAT Publishing House
1. The document discusses urban flooding in Bangalore, India. It describes how factors like heavy rainfall, population growth, and improper land use have contributed to increased flooding in the city.
2. Flooding events in 2013 are analyzed in detail. A November rainfall caused runoff six times higher than the drainage capacity, inundating low-lying residential areas.
3. Impacts of urban flooding include disrupted daily life, damaged infrastructure, and decreased economic activity in affected areas. The document calls for improved flood management strategies to better mitigate urban flooding risks in Bangalore.
Enhancing post disaster recovery by optimal infrastructure capacity buildingeSAT Publishing House
This document discusses enhancing post-disaster recovery through optimal infrastructure capacity building. It presents a model to minimize the cost of meeting demand using auxiliary capacities when disaster damages infrastructure. The model uses genetic algorithms to select optimal capacity combinations. The document reviews how infrastructure provides vital services supporting recovery activities and discusses classifying infrastructure into six types. When disaster reduces infrastructure services, a gap forms between community demands and available support, hindering recovery. The proposed research aims to identify this gap and optimize capacity selection to fill it cost-effectively.
Effect of lintel and lintel band on the global performance of reinforced conc...eSAT Publishing House
This document analyzes the effect of lintels and lintel bands on the seismic performance of reinforced concrete masonry infilled frames through non-linear static pushover analysis. Four frame models are considered: a frame with a full masonry infill wall; a frame with a central opening but no lintel/band; a frame with a lintel above the opening; and a frame with a lintel band above the opening. The results show that the full infill wall model has 27% higher stiffness and 32% higher strength than the model with just an opening. Models with lintels or lintel bands have slightly higher strength and stiffness than the model with just an opening. The document concludes lintels and lintel
Wind damage to trees in the gitam university campus at visakhapatnam by cyclo...eSAT Publishing House
1) A cyclone with wind speeds of 175-200 kph caused massive damage to the green cover of Gitam University campus in Visakhapatnam, India. Thousands of trees were uprooted or damaged.
2) A study assessed different types of damage to trees from the cyclone, including defoliation, salt spray damage, damage to stems/branches, and uprooting. Certain tree species were more vulnerable than others.
3) The results of the study can help in selecting more wind-resistant tree species for future planting and reducing damage from future storms.
Wind damage to buildings, infrastrucuture and landscape elements along the be...eSAT Publishing House
1) A visual study was conducted to assess wind damage from Cyclone Hudhud along the 27km Visakha-Bheemli Beach road in Visakhapatnam, India.
2) Residential and commercial buildings suffered extensive roof damage, while glass facades on hotels and restaurants were shattered. Infrastructure like electricity poles and bus shelters were destroyed.
3) Landscape elements faced damage, including collapsed trees that damaged pavements, and debris in parks. The cyclone wiped out over half the city's green cover and caused beach erosion around protected areas.
1) The document reviews factors that influence the shear strength of reinforced concrete deep beams, including compressive strength of concrete, percentage of tension reinforcement, vertical and horizontal web reinforcement, aggregate interlock, shear span-to-depth ratio, loading distribution, side cover, and beam depth.
2) It finds that compressive strength of concrete, tension reinforcement percentage, and web reinforcement all increase shear strength, while shear strength decreases as shear span-to-depth ratio increases.
3) The distribution and amount of vertical and horizontal web reinforcement also affects shear strength, but closely spaced stirrups do not necessarily enhance capacity or performance.
Role of voluntary teams of professional engineers in dissater management – ex...eSAT Publishing House
1) A team of 17 professional engineers from various disciplines called the "Griha Seva" team volunteered after the 2001 Gujarat earthquake to provide technical assistance.
2) The team conducted site visits, assessments, testing and recommended retrofitting strategies for damaged structures in Bhuj and Ahmedabad. They were able to fully assess and retrofit 20 buildings in Ahmedabad.
3) Factors observed that exacerbated the earthquake's impacts included unplanned construction, non-engineered buildings, improper prior retrofitting, and defective materials and workmanship. The professional engineers' technical expertise was crucial for effective post-disaster management.
This document discusses risk analysis and environmental hazard management. It begins by defining risk, hazard, and toxicity. It then outlines the steps involved in hazard identification, including HAZID, HAZOP, and HAZAN. The document presents a case study of a hypothetical gas collecting station, identifying potential accidents and hazards. It discusses quantitative and qualitative approaches to risk analysis, including calculating a fire and explosion index. The document concludes by discussing hazard management strategies like preventative measures, control measures, fire protection, relief operations, and the importance of training personnel on safety.
Review study on performance of seismically tested repaired shear wallseSAT Publishing House
This document summarizes research on the performance of reinforced concrete shear walls that have been repaired after damage. It begins with an introduction to shear walls and their failure modes. The literature review then discusses the behavior of original shear walls as well as different repair techniques tested by other researchers, including conventional repair with new concrete, jacketing with steel plates or concrete, and use of fiber reinforced polymers. The document focuses on evaluating the strength retention of shear walls after being repaired with various methods.
Monitoring and assessment of air quality with reference to dust particles (pm...eSAT Publishing House
This document summarizes a study on monitoring and assessing air quality with respect to dust particles (PM10 and PM2.5) in the urban environment of Visakhapatnam, India. Sampling was conducted in residential, commercial, and industrial areas from October 2013 to August 2014. The average PM2.5 and PM10 concentrations were within limits in residential areas but moderate to high in commercial and industrial areas. Exceedance factor levels indicated moderate pollution for residential areas and moderate to high pollution for commercial and industrial areas. There is a need for management measures like improved public transport and green spaces to combat particulate air pollution in the study areas.
Low cost wireless sensor networks and smartphone applications for disaster ma...eSAT Publishing House
This document describes a low-cost wireless sensor network and smartphone application system for disaster management. The system uses an Arduino-based wireless sensor network comprising nodes with various sensors to monitor the environment. The sensor data is transmitted to a central gateway and then to the cloud for analysis. A smartphone app connected to the cloud can detect disasters from the sensor data and send real-time alerts to users to help with early evacuation. The system aims to provide low-cost localized disaster detection and warnings to improve safety.
Coastal zones – seismic vulnerability an analysis from east coast of indiaeSAT Publishing House
This document summarizes an analysis of seismic vulnerability along the east coast of India. It discusses the geotectonic setting of the region as a passive continental margin and reports some moderate seismic activity from offshore in recent decades. While seismic stability cannot be assumed given events like the 2004 tsunami, no major earthquakes have been recorded along this coast historically. The document calls for further study of active faults, neotectonics, and implementation of improved seismic building codes to mitigate vulnerability.
Can fracture mechanics predict damage due disaster of structureseSAT Publishing House
This document discusses how fracture mechanics can be used to better predict damage and failure of structures. It notes that current design codes are based on small-scale laboratory tests and do not account for size effects, which can lead to more brittle failures in larger structures. The document outlines how fracture mechanics considers factors like size effect, ductility, and minimum reinforcement that influence the strength and failure behavior of structures. It provides examples of how fracture mechanics has been applied to problems like evaluating shear strength in deep beams and investigating a failure of an oil platform structure. The document argues that fracture mechanics provides a more scientific basis for structural design compared to existing empirical code provisions.
This document discusses the assessment of seismic susceptibility of reinforced concrete (RC) buildings. It begins with an introduction to earthquakes and the importance of vulnerability assessment in mitigating earthquake risks and losses. It then describes modeling the nonlinear behavior of RC building elements and performing pushover analysis to evaluate building performance. The document outlines modeling RC frames and developing moment-curvature relationships. It also summarizes the results of pushover analyses on sample 2D and 3D RC frames with and without shear walls. The conclusions emphasize that pushover analysis effectively assesses building properties but has limitations, and that capacity spectrum method provides appropriate results for evaluating building response and retrofitting impact.
A geophysical insight of earthquake occurred on 21 st may 2014 off paradip, b...eSAT Publishing House
1) A 6.0 magnitude earthquake occurred off the coast of Paradip, Odisha in the Bay of Bengal on May 21, 2014 at a depth of around 40 km.
2) Analysis of magnetic and bathymetric data from the area revealed the presence of major lineaments in NW-SE and NE-SW directions that may be responsible for seismic activity through stress release.
3) Movements along growth faults at the margins of large Bengal channels, due to large sediment loads, could also contribute to seismic events by triggering movements along the faults.
Effect of hudhud cyclone on the development of visakhapatnam as smart and gre...eSAT Publishing House
This document discusses the effects of Cyclone Hudhud on the development of Visakhapatnam as a smart and green city through a case study and preliminary surveys. The surveys found that 31% of participants had experienced cyclones, 9% floods, and 59% landslides previously in Visakhapatnam. Awareness of disaster alarming systems increased from 14% before the 2004 tsunami to 85% during Cyclone Hudhud, while awareness of disaster management systems increased from 50% before the tsunami to 94% during Hudhud. The surveys indicate that initiatives after the tsunami improved awareness and preparedness. Developing Visakhapatnam as a smart, green city should consider governance
Literature Review Basics and Understanding Reference Management.pptxDr Ramhari Poudyal
Three-day training on academic research focuses on analytical tools at United Technical College, supported by the University Grant Commission, Nepal. 24-26 May 2024
Low power architecture of logic gates using adiabatic techniquesnooriasukmaningtyas
The growing significance of portable systems to limit power consumption in ultra-large-scale-integration chips of very high density, has recently led to rapid and inventive progresses in low-power design. The most effective technique is adiabatic logic circuit design in energy-efficient hardware. This paper presents two adiabatic approaches for the design of low power circuits, modified positive feedback adiabatic logic (modified PFAL) and the other is direct current diode based positive feedback adiabatic logic (DC-DB PFAL). Logic gates are the preliminary components in any digital circuit design. By improving the performance of basic gates, one can improvise the whole system performance. In this paper proposed circuit design of the low power architecture of OR/NOR, AND/NAND, and XOR/XNOR gates are presented using the said approaches and their results are analyzed for powerdissipation, delay, power-delay-product and rise time and compared with the other adiabatic techniques along with the conventional complementary metal oxide semiconductor (CMOS) designs reported in the literature. It has been found that the designs with DC-DB PFAL technique outperform with the percentage improvement of 65% for NOR gate and 7% for NAND gate and 34% for XNOR gate over the modified PFAL techniques at 10 MHz respectively.
Introduction- e - waste – definition - sources of e-waste– hazardous substances in e-waste - effects of e-waste on environment and human health- need for e-waste management– e-waste handling rules - waste minimization techniques for managing e-waste – recycling of e-waste - disposal treatment methods of e- waste – mechanism of extraction of precious metal from leaching solution-global Scenario of E-waste – E-waste in India- case studies.
Advanced control scheme of doubly fed induction generator for wind turbine us...IJECEIAES
This paper describes a speed control device for generating electrical energy on an electricity network based on the doubly fed induction generator (DFIG) used for wind power conversion systems. At first, a double-fed induction generator model was constructed. A control law is formulated to govern the flow of energy between the stator of a DFIG and the energy network using three types of controllers: proportional integral (PI), sliding mode controller (SMC) and second order sliding mode controller (SOSMC). Their different results in terms of power reference tracking, reaction to unexpected speed fluctuations, sensitivity to perturbations, and resilience against machine parameter alterations are compared. MATLAB/Simulink was used to conduct the simulations for the preceding study. Multiple simulations have shown very satisfying results, and the investigations demonstrate the efficacy and power-enhancing capabilities of the suggested control system.
6th International Conference on Machine Learning & Applications (CMLA 2024)ClaraZara1
6th International Conference on Machine Learning & Applications (CMLA 2024) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of on Machine Learning & Applications.
CHINA’S GEO-ECONOMIC OUTREACH IN CENTRAL ASIAN COUNTRIES AND FUTURE PROSPECTjpsjournal1
The rivalry between prominent international actors for dominance over Central Asia's hydrocarbon
reserves and the ancient silk trade route, along with China's diplomatic endeavours in the area, has been
referred to as the "New Great Game." This research centres on the power struggle, considering
geopolitical, geostrategic, and geoeconomic variables. Topics including trade, political hegemony, oil
politics, and conventional and nontraditional security are all explored and explained by the researcher.
Using Mackinder's Heartland, Spykman Rimland, and Hegemonic Stability theories, examines China's role
in Central Asia. This study adheres to the empirical epistemological method and has taken care of
objectivity. This study analyze primary and secondary research documents critically to elaborate role of
china’s geo economic outreach in central Asian countries and its future prospect. China is thriving in trade,
pipeline politics, and winning states, according to this study, thanks to important instruments like the
Shanghai Cooperation Organisation and the Belt and Road Economic Initiative. According to this study,
China is seeing significant success in commerce, pipeline politics, and gaining influence on other
governments. This success may be attributed to the effective utilisation of key tools such as the Shanghai
Cooperation Organisation and the Belt and Road Economic Initiative.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
DEEP LEARNING FOR SMART GRID INTRUSION DETECTION: A HYBRID CNN-LSTM-BASED MODELgerogepatton
As digital technology becomes more deeply embedded in power systems, protecting the communication
networks of Smart Grids (SG) has emerged as a critical concern. Distributed Network Protocol 3 (DNP3)
represents a multi-tiered application layer protocol extensively utilized in Supervisory Control and Data
Acquisition (SCADA)-based smart grids to facilitate real-time data gathering and control functionalities.
Robust Intrusion Detection Systems (IDS) are necessary for early threat detection and mitigation because
of the interconnection of these networks, which makes them vulnerable to a variety of cyberattacks. To
solve this issue, this paper develops a hybrid Deep Learning (DL) model specifically designed for intrusion
detection in smart grids. The proposed approach is a combination of the Convolutional Neural Network
(CNN) and the Long-Short-Term Memory algorithms (LSTM). We employed a recent intrusion detection
dataset (DNP3), which focuses on unauthorized commands and Denial of Service (DoS) cyberattacks, to
train and test our model. The results of our experiments show that our CNN-LSTM method is much better
at finding smart grid intrusions than other deep learning algorithms used for classification. In addition,
our proposed approach improves accuracy, precision, recall, and F1 score, achieving a high detection
accuracy rate of 99.50%.
KuberTENes Birthday Bash Guadalajara - K8sGPT first impressionsVictor Morales
K8sGPT is a tool that analyzes and diagnoses Kubernetes clusters. This presentation was used to share the requirements and dependencies to deploy K8sGPT in a local environment.
Iron and Steel Technology Roadmap - Towards more sustainable steelmaking.pdf
Organic solar cells principles, mechanism and recent dvelopments
1. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 03 Issue: 09 | Sep-2014, Available @ http://www.ijret.org 338
ORGANIC SOLAR CELLS: PRINCIPLES, MECHANISM AND RECENT DVELOPMENTS Vivek K. A1, G. D. Agrawal2 1Student, M.Tech- Energy Engineering, Department of Mechanical Engineering, Malaviya National Institute of Technology, Jaipur, Rajasthan, India 2Associate Professor, Department of Mechanical Engineering, Malaviya National Institute of Technology, Jaipur, Rajasthan, India Abstract Over the past decade organic solar cells dragged lot of attention and research interest due to its wide potential and advantages such as low cost, made of abundant earth materials, simple manufacturing techniques and ability to incorporate various technologies. Although a lot amount of research and development is required to effectively tackle the foreseen advantages. This paper reviews basic fundamental physics of organic solar cells, working mechanism and recent developments in the field. Keywords: Organic solar cell, Plastic/Polymer solar cell, Organic solar cell mechanism, Organic solar cell physics
--------------------------------------------------------------------***---------------------------------------------------------------------- 1. INTRODUCTION The demand for high efficient and affordable solar photovoltaic technologies had resulted in widespread research and development of various technologies including organic solar cells, dye sensitized solar cells [1], quantum dot solar cells [2] etc. Of all the upcoming alternative organic solar cells possesses distinctive advantages such as low cost, made of abundant earth materials, simple manufacturing techniques and ability to incorporate various other technologies [3]. The current highest reported efficiency of organic solar cells are above 10% [4] and it is widely regarded that the lower operating efficiency of organic solar cells compared to that of typical silicon solar cells doesn‟t hinder the commercialization potential of organic cells due to its other advantages [5]. Although many other technical limitations and drawbacks including low stability and lifetime [6], limitations in understanding of basic device physics [7] etc. are to be addressed in the very near future as the technology is on the verge of mass commercialization. This paper reviews basic fundamental physics of organic solar cells, working mechanism and recent developments in the field. 2. BASIC PRINCIPLES OF ORGANIC PHOTOVOLTAIC DEVICES
Typically most of the organic compounds are inert for electrical conductivity due to the presence of strong covalent bonds. But this general perception was altered by the discovery of conducting polymers by H. Shirakawa, Alan G. M. and Alan J. Heeger in 1977 [8]. In their experiment, trans-polyacetylene was exposed to chlorine, bromine or iodine vapour, which resulted in increase in conductivity of polyacetylene films. This discovery opened up a recently new and wide range of applications including organic displays, organic LEDs, organic and micro-electronics and organic photovoltaics.
Whatever the organic semiconductors be, such as macro molecule dyes, dendrimers, oligomers, polymers etc. all are based on conjugated π electron system. A conjugated system is an alteration between the single and double bonds. The important property related to this conjugation are that the π electrons are more mobile than σ electrons. Therefore by absorption of energy as in case of organic solar cells or by absorbing electrical energy in case of organic LEDs or displays, the π bonds system breaks creating excitons or free charges or emission of light. Molecular π-π* orbitals corresponds to the Highest Occupied Molecular Orbital (HOMO) and Lowest Unoccupied Molecular Orbital (LUMO). In a crystalline semiconductor these corresponds to conduction band (CB) and valence band (VB) [9, 10]. However there are considerable differences in basic physics of HOMO-LUMO as there exists strong Van der Waals forces which are no longer considerable in CB/VB formation. Another major differences arises in transport process which is mainly by hopping process between localized states rather than transport within the band. In case of polymers and oligomers, there is hopping along conjugated chain and inter molecular charge transport between adjacent polymer chains or molecules. However the mobility in case of later process is smaller. Thus mobility of thin films can be improved by improving order, purification, high vaccum deposition and no oxygen contamination [11, 12]. 3. ORGANIC SOLAR CELL: MECHANISM
The operating mechanism of organic solar cells are one of the most researched and debated fields. In general all the main differences in mechanism in case of organic solar cell arises due to the generation of electrostatically bound
2. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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electron-hole pair in organic solar cells instead of free charges. Further, this concept is explained in detail. 3.1 Absorption of Light and Exciton Generation The presence of conjugated pi electron system in organic compounds results in all interesting optical and electrical properties. The bandgap or bond energy in organic semiconductors is tuned with the energy of solar spectrum causing the absorption of photons producing electrostatically coupled electron hole pairs called excitons. In case of inorganic silicon semiconductors, produces free charges instead of excitons. This major change drives all the differences in mechanism of electricity generation in inorganic and organic solar photovoltaic devices. 3.2 Exciton Diffusion The photo generated excitons are characterized by very small lifetime of few picoseconds limiting the mobility of excitons to a few polymer units or molecules. The exciton moves within the chain causing chain deformation in order to reduce the extra unstable energy, which is altogether called polaron. However inter-molecular transition of excitons also happens which is termed as hopping process. Altogether the overall mobility of excitons are limited to a range of 10 nm, which is called the exciton diffusion length. As the excitons are to be dissociated within the range of this length, exciton diffusion length plays a critical role in design and performance of organic solar cells. 3.3 Exciton Dissociation Exciton dissociation refers to process of splitting the electrostatically coupled electron hole pair into free charges. The dissociation of excitons occurs at the donor acceptor interfaces or junctions. The donor and acceptor materials are designed such that there exists a difference in LUMO levels of the materials, which drives the exciton dissociation. For efficient dissociation, the difference in energy level of LUMO of donor and acceptor should be higher than that of exciton binding energy. Typically the difference is around 0.2-0.3 eV. In general, to achieve efficient charge separation Δ (LUMOD-LUMOA)>Exciton binding energy 3.4 Charge Transport Once the free charges are produced, they travel through specific materials to get collected at the electrodes. From there they are connected to the external circuit. The efficiency of charge transport are determined by the electrical conductivity and impedance of the organic materials [13-16]. 4. RECENT DEVELOPMENTS
Recent developments in the field of organic solar cell had shown promising results with maximum recorded efficiency over 10%. Overall the researches in the field could be accounted into three sections including study of basic physics and charge transfer dynamics, development of new architectures and novel concepts and materials development for various applications. This section mainly focuses on researches on basic device physics and charge transfer dynamics.
The most important focus is researches are on understanding the working mechanism of organic solar cell. The most primary question of debate is how the bound electron-hole pair splits. The most widely accepted explanation to this question is „hot exciton effect‟. Hot exciton effect describes that when electron is absorbed into one semiconductor material from the other, it carries the differences in energy with it, making the electron hot, gaining velocity with which it escapes from the bounded exciton state. Though this hypothesis is widely accepted recently there has been lots of studies questioning the credibility of the hot exciton hypothesis [17, 18]. Many researchers believe that the electrons that breaks up from the bound state doesn‟t became hot or gains excess velocity. A lot amount of researches are directed in this direction by spectroscopic studies. Another focus of research is the molecular and intermixed semisolid structure of the semiconductor, where the differences in phase could lead to splitting of excitons [19]. Rather focusing onto various study techniques, it can be generalized that advances in simulation techniques and sophisticated experimental methods are two most promising research tools that are developing onto the study basic physics and charge transport dynamics in organic solar cell operation. The important computational methodologies that are employed in the study of organic solar cells includes quantum mechanical theories for charge transfer excitations, application to density functional theory (DFT) methods in charge transfer excitations etc. In quantum mechanical simulation of quantum chemistry time dependent density functional theory (TDDFT) has been the most important tool in computations for excited state properties and charge transfer excitations in large systems. [20, 21] Time- dependent density functional theory (TDDFT) is a quantum mechanical theory used in chemistry and physics to investigate the dynamics and properties of many-body systems in the presence of time-dependent potentials, such as electric or magnetic fields. The effect of such fields on molecules and solids can be studied with TDDFT to extract features like excitation energies, frequency-dependent response properties, and photo-absorption spectra.Though the implementation of TDDFT calculations on to photovoltaic systems possesses a number of challenges particularly with respect to long range charge transfer interactions. The effect of assumptions in this applications possibly results in catastrophic errors in simulations. Many theories and improvements have been suggested to this basic approach to enhance the results of simulation [22, 23].
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Another method is constraint variational approach including constrained DFT (CDFT), which effectively overcomes many drawbacks in the TDDFT approach. CDFT is mainly applicable to systems whose ground state electron density satisfies some specific constraints. In some electron transfer reactions, the constraint amount to localization of the electronic density such that the difference in the number of electrons between donor and acceptor is reduced by two compared to that of the unconstrained ground state [24-28]. The other widely used methodology in simulation study includes the applications of DFT methods in CT excitations. Density functional theory (DFT) is a computational quantum mechanical modelling method used in chemistry, physics and materials science to investigate the electronic structure (principally the ground state) of many-body systems, in particular atoms, molecules, and the condensed phases. With this theory, the properties of a many-electron system can be determined by using functionals, i.e. functions of another function. DFT based computational methods can be used to calculate or develop structure function relationships for many properties of importance in organic photovoltaics including bandgap, optical absorption, intra-molecular and inter-molecular charge transfer, exciton binding energy, charge transfer integral, reorganization energy and the rate of charge transfer and recombination in donor-acceptor complexes. In practical systems, the effects of the surrounding organic photovoltaics media on these properties should be taken into account. Although the effect of medium depends both on its nature and on that of the transitions involved, at least solvation can be routinely taken into account at reasonable computational cost by considering polarization continuum solvation models [29, 30]. The direction of experimental research going on this field primarily accounts onto spectroscopic analysis of the processes involved in the conversion processes. It possess many challenges on obtaining a detailed description as the processes happens within a time of few picoseconds. As pointed an important controversial statement in the field is that the main focus of this research have been towards development and study of semiconductors which are capable of extracting the energy by making hot electrons. The out of equation on this point demands for the change of focus from developing semiconductors that extract hot electrons to semiconductors which are capable of extracting energy out of it without the electrons being hot. It suggest towards a fundamental shift in the organic photovoltaics research [31, 32]. 5. CONCLUSION Organic solar cells shows good promises in the development of low cost photovoltaic alternatives. A structured and systematic research are required in the field to successfully utilize the foreseen advantages of organic solar cells.
The review on basic physics, charge transfer dynamics, mechanism and recent approaches and developments in the field are carried out. It is very important to understand the basic mechanism of operation in conversion of light into electricity. Since all the design, architecture and materials developments revolve around our level of understanding of the basic mechanism it accounts chief importance in all researches going on in the field of organic photovoltaics.
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