Triple junction based high efficiency tandem solar cells
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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.
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E = g lk+ 2
+ − − +
r m 0 m 0 4 ε 0 h ( ε 0 2 e 0 m 0
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This document contains information about a group project on solar energy. It lists the names and roll numbers of 5 students in the group, including the group leader, assistant group leader, and 3 members. It then outlines the topics to be covered, including basics of solar energy, photovoltaic cells, solar thermal systems, economic analysis, and an introduction discussing solar radiation and the potential of solar energy.
SOLAR CELLS
Solar cells, also known as photovoltaic cells, convert sunlight directly into electricity through the photovoltaic effect. The first solar cell was invented in 1883 by Charles Fritts, but early cells had efficiencies less than 1%. In 1954, researchers designed a silicon solar cell with 6% efficiency, a breakthrough. Solar cells work by using photons from sunlight to knock electrons loose, generating a current as the electrons flow through the cell. Assemblies of solar cells make solar modules which can be combined into solar panels to capture energy from sunlight.
Solar Cells Technology: An Engine for National Development
This document provides an overview of solar cell technology. It discusses how solar cells work based on the electronic properties of semiconductors. Solar cells use n-type and p-type semiconductors to generate an electric field that separates electrons and holes when exposed to light, producing electricity. The document also examines the structures of different solar cell materials like crystalline silicon, amorphous silicon, cadmium telluride, and gallium arsenide. It reviews trends showing decreasing costs over time for the silicon material, the solar cells, and solar modules.
Solar energy harvesting and its applications
This document discusses solar energy harvesting. It begins by defining solar energy harvesting as the process of capturing and storing solar energy radiated from the sun, and converting it to electrical energy. It then discusses why solar energy harvesting is needed, as the sun provides vast amounts of renewable energy, and fossil fuels are limited. Various methods of solar energy harvesting are outlined, including solar thermal collectors, concentrating solar power, and photovoltaic technology. Recent innovations in solar energy harvesting are also summarized, such as mimicking butterfly wings to increase panel efficiency and developing spherical solar generators. Applications like solar roadways and powering electric vehicles are also mentioned.
IRJET- Experimental Studies on Electrical Characteristics of Solar PV Panel w...
This document summarizes an experimental study on the electrical characteristics of a monocrystalline solar photovoltaic (PV) panel under different conditions: shadow, dust accumulation, and thermal effects from water spray. The study measured the current, voltage, maximum power, and other output parameters of the solar panel under each condition and plotted current-voltage and power-voltage curves. The results showed that shadowing, dust accumulation, and increasing panel temperature each reduced the maximum power output of the solar panel compared to measurements taken in clear outdoor conditions without obstructions. The purpose of the study was to better understand how these real-world factors impact solar panel performance.
Nano tubes technology in solar
- Carbon nanotubes are being used in solar panel technology to improve efficiency by allowing the panels to utilize infrared radiation. The nanotubes act as photoconversion sites and help transport charge carriers. This can increase theoretical efficiency to 80%.
- Double-walled carbon nanotubes are directly incorporated into thin film solar cells, creating a p-n heterojunction with silicon. Nanotubes serve as both a light absorber and charge transport layer. Initial tests show an efficiency over 1%.
- Advantages of carbon nanotube solar panels include improved efficiency, ability to operate at night, increased output voltage, and reduced material needs. However, the technology remains in the experimental stage.
rural electrification
this is a presentation done to give awareness about power generation and generation using renewable energy sources to children s .In this presentation a new approach of using renewable is give that is "INTEGRATION OF RENEWABLE ENERGY RESOURCES"
Solar Energy
This document provides an overview of solar energy, including its history, development, technologies, applications, advantages and disadvantages. It discusses how solar cells work by converting sunlight into electricity through the photovoltaic effect. Different types of solar cells and panels are described, as well as the process of installing a solar energy system. Opportunities and challenges of solar power in Pakistan are highlighted, along with various uses of solar energy from heating to transportation.
Solar energy
Solar panels are devices that convert sunlight into electricity through photovoltaic cells. There are different types of solar panels including monocrystalline, polycrystalline, and amorphous silicon panels. Solar panels are made of layers of semiconductor materials that produce a flow of electrons when struck by sunlight. Proper positioning of solar panels maximizes sunlight exposure. Benefits of solar panels include being pollution-free, renewable, and requiring little maintenance.
SOLAR CELLS
Solar cells convert sunlight directly into electricity through the photovoltaic effect. They are made of semiconducting materials, most commonly silicon, and work by exciting electrons from their atomic orbitals when photons in sunlight hit the solar cell. The excited electrons are then able to flow through the material as an electrical current that is captured. The theoretical maximum efficiency for a single-junction silicon solar cell is around 33.7%, and recent advances have achieved efficiencies over 25% in the lab. Solar cells are assembled into solar panels that can generate electrical power from sunlight for uses like powering homes, businesses, vehicles and more.
huen2016.pdf
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.
SOLAR CELLS.pptx
This document provides an overview of a presentation on solar cells given at Kwame Nkrumah University of Science & Technology in Ghana. The presentation covers the structure and operation of solar cells, materials used in solar panels, solar panel design, applications of solar cells, and concludes with references. Solar cells convert sunlight directly into electricity via the photovoltaic effect and do not require chemical reactions or moving parts like other energy sources. They are made of semiconducting materials arranged in a structure that separates light-generated electron-hole pairs to produce a voltage and current.
SOLAR ENERGY & PV CELLS BY G.DINESHPIRAN
This document summarizes information about solar energy and photovoltaic (PV) cells. It discusses the basic concepts of solar energy, how PV cells work, the history and types of solar cells including silicon and thin film cells. The document also covers the advantages of solar energy as a renewable resource and its increasing use in India. However, it notes some disadvantages of solar cells such as their initial cost and inefficiency in cloudy conditions.
INFRARED PLASTIC SOLAR CELL.pptx
This document summarizes a seminar presentation about infrared plastic solar cells. It discusses how these cells use quantum dots and nanorods to harness infrared radiation from the sun for electricity generation. This allows plastic solar cells to work even on cloudy days. While currently more expensive than traditional solar cells, infrared plastic cells could become more efficient and widespread if costs decrease. The presentation compares plastic cells to traditional photovoltaic panels and outlines applications, advantages, and the single disadvantage of cost.
Solar energy and PV cells
Presentation covering almost every topic related to the title with brief explanation .
solar energy and how to help poor with sun energy ppt
India faces acute energy scarcity that hinders growth, but renewable energy can help. Solar power in particular has potential due to India's climate, and could provide 18% of capacity by addressing challenges like grid integration and high costs. For poor people, solar technologies can help as the upfront costs are reasonable for small loads and there are no running costs, allowing the system to pay for itself in 5-7 years. Widespread adoption of renewable energy could power India and support its development.
Description of a photovoltaic effect and solar panels
The document provides an introduction to photovoltaic effects and solar panels. It describes how solar panels and solar cells work by using a combination of materials to cause a chemical reaction when exposed to sunlight that separates protons into electrons and neutrons, generating direct current power. It discusses the history of solar cells and improvements over time that have increased efficiency. The document also outlines different types of solar panels including multi-junction, thin-film, and crystalline silicon panels as well as manufacturers and factors that influence the price of solar panels.
cnt ppt
This document discusses the use of carbon nanotubes in solar panels to improve efficiency. It provides background on solar panels and carbon nanotubes, explaining their properties. It then details the history of carbon nanotube solar panels, how they are constructed, and how double-walled carbon nanotubes can be used as both light absorbers and charge carriers. Using carbon nanotubes allows solar panels to utilize infrared light and increase efficiency to potentially 80%. Their properties like high mobility and strength make them suitable for more efficient solar energy conversion.
Infrared Plastic Solar Cell PPT
The document discusses infrared plastic solar cells. It describes the construction of these solar cells as a hybrid of tiny nanorods dispersed in an organic polymer or plastic layer only 200 nanometers thick sandwiched between electrodes. The nanorods are made of cadmium selenide and act as wires that absorb light and generate electrons and holes. Infrared plastic solar cells could harness invisible infrared light and be five times more efficient than traditional solar cells. They also work on cloudy days due to their ability to absorb infrared light. While costly now, infrared plastic solar cells show promise as a more compact and flexible alternative energy source.
solar cells new
The document discusses the history and development of solar power as an alternative energy source. It describes how the 1970s energy crisis led scientists to search for renewable sources of energy like solar power. The document then provides details on the different methods of generating solar power, specifically concentrated solar power and photovoltaics, and explains the basic scientific principles behind how solar cells work to convert sunlight into electricity.
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Triple junction based high efficiency tandem solar cells
- 1. Submitted by: Pritam Rath Regd No: 0911013206 Electrical Engineering Guided By: Mr. Manas Ranjan Nayak Assistant Professor Department of Electrical Engineering ITER, BHUBANESWAR
- 2. Present and Future Efficiency Analysis Triple Junction Tandem Solar Cells Solar Cells How to Harness Solar Power Solar Energy – An Overview
- 3. The output of sun is 2.8 1023KWH/year. The energy reaching the earth is 1.5 1018KWH/year. Solar energy technologies include solar heating, solar photovoltaics, Solar air conditioning, Solar lamp, Space- based solar power.
- 5. P N P N Solar Power is converted to electricity using PV (Photovoltaic) effect.Solar Power is concentrated and converted to thermal energy which is converted to electric energy.
- 6. Triple Junction based High Efficiency Tandem Solar Cells
- 7. In 1839, Edmond Becquerel found that two different brass plates immersed in a liquid produced a continuous current when illuminated with sunlight. We now believe that he had made a copper - cuprous oxide thin - film solar cell. Later in the 1870s, Willoughby Smith, W. G. Adams, and R. E. Day discovered a PV effect in selenium. A solar cell is a semi-conducting device made of silicon or other materials, which, when exposed to sunlight, generates electricity. It uses the Photovoltaic technology.
- 10. Mono-Crystalline silicon cells Poly Crystalline Solar Cells Thin Film Solar Cells Multi-junction Solar Cells
- 11. Triple Junction based High Efficiency Tandem Solar Cells
- 13. Si Si Si Si Si Valence Band Forbidden Band Gap Ev Ec SILICON STRUCTURE Energy Conduction Band
- 15. Conduction Band Valence Band Forbidden Band Gap Ev Ec Energy Valence Band Ev Ec EfEnergy Band Gap SILICON GaInAs Conduction Band
- 16. Triple Junction based High Efficiency Tandem Solar Cells
- 18. The efficiency in recent years have been 60% in satellites and nearly 85% in laboratory for 30cm2 cell at 200 suns. As compared to its counter parts such as other silicon solar cells having efficiency nearly 20%. The most important factor is the end-of-life (EOL) efficiency.
- 20. Presently this kind of Solar cell technology is only restricted to space applications. All the Satellites use this kind of Solar Cells. The main hindrance in the commercialization of this kind of solar cell is the cost. Cost of these solar cells is $2.48/cm2. Lots of research work is going on to reduce the price.
- 21. T. Takamoto, K. Sasaki et al., Proceedings of the 35th IEEE Photovoltaic Specialists Conference, Hawaii, USA, June 2010. Research and Development Trends of Solar Cell for Highly Efficiency daisuke kanama, hiroshi kawamoto Nanotechnology and Materials Research Unit, quarterly review no.28/july 2008. Martin A. Green, Keith Emery, Yoshihiro Hishikawa and Wilhelm Warta, “Solar cell efficiency tables”, Published online 18 June 2010 in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/pip.1021.