This document discusses various materials used in microelectromechanical systems (MEMS) and nanoelectromechanical systems (NEMS) devices. It focuses on silicon as the most widely used substrate material due to its mechanical stability, piezoresistive properties, and compatibility with microfabrication. Other important materials discussed include silicon compounds like silicon dioxide, silicon carbide, and silicon nitride. Polymers and metals are also reviewed for their roles in MEMS/NEMS design and fabrication.
The radio frequency microelectromechanical system (RF MEMS) Materials Jitendra Jangid
RF technologies. Besides RF MEMS technology, III-V compound semiconductor (GaAs, GaN, InP, InSb), ferrite, ferroelectric, silicon-based semiconductor (RF CMOS, SiC and SiGe), and vacuum tube technology are available to the RF designer. Each of the RF technologies offers a distinct trade-off between cost, frequency, gain, large-scale integration, lifetime, linearity, noise figure, packaging, power handling, power consumption, reliability, ruggedness, size, supply voltage, switching time and weight.
This document discusses materials used for MEMS and microsystems, including substrates, active materials, and packaging materials. Common substrate materials include silicon, quartz, and various polymers. Silicon is discussed in detail due to its ideal properties as a substrate. Other materials covered include silicon compounds, piezoelectric crystals, and conductive polymers. The document concludes with a brief overview of packaging materials and methods.
The document provides information on VLSI technology course syllabus covering topics such as cleanroom technology, epitaxy, oxidation, diffusion, lithography, etching, and metallization. It discusses the creation of electronic grade silicon from sand through processes like reduction, purification, crystal growth via Czochralski method, wafer shaping through sawing and polishing to produce uniform thickness wafers ready for fabrication.
Micro-electromechanical systems (MEMS) combine mechanical and electrical components on a silicon chip using microfabrication techniques. MEMS can sense, control, and actuate on a microscale and generate macroscale effects. Common MEMS fabrication techniques include deposition, patterning, etching, and micromachining of materials like silicon and metals. There are three main micromachining methods: bulk micromachining which removes silicon substrate material, surface micromachining which builds up thin films, and high-aspect-ratio micromachining (HARM) which allows molding of high-resolution microstructures. LIGA is a specialized HARM technique that uses x-rays to pattern thick photoresist
The document provides an overview of integrated circuit fabrication processes. It discusses the basic steps including wafer production, epitaxial growth, etching, masking, doping, diffusion, implantation, and metallization. It also describes the fabrication processes for MOSFETs including NMOS, PMOS and CMOS. BiCMOS fabrication is also summarized, which combines BJT and CMOS processes to achieve high speed and low power benefits.
Metallic micro lattices are a new class of synthetic porous material that combines useful mechanical properties of metals with optimized geometric structures. They consist of micro-scale struts arranged in different lattice patterns and can be manufactured using additive manufacturing techniques. Metallic micro lattices provide greater stiffness and strength compared to solid metals due to their low density, ability to absorb impact energy, and potential to recover their original shape. They have applications in aerospace, automotive, and other structural engineering fields due to their mechanical properties and lightweight nature.
Classification of Engineering Materials, Engineering requirements of materials. Akash Patel
- Materials can be divided into two main classes: crystalline and non-crystalline. The key materials classes discussed are metals/metal alloys, ceramics, semiconductors, polymers, and composites.
- Metals/alloys make up the largest proportion of materials by quantity and value, with steels being the most prevalent alloy. Ceramics range from soft to very hard materials. Semiconductors are foundational to electronics. Polymers are used to create plastics. Composites combine materials for specific properties.
- When selecting materials, key engineering requirements include the material's ability to be fabricated, suitability for the service conditions, and possession of appropriate mechanical, chemical
The radio frequency microelectromechanical system (RF MEMS) Materials Jitendra Jangid
RF technologies. Besides RF MEMS technology, III-V compound semiconductor (GaAs, GaN, InP, InSb), ferrite, ferroelectric, silicon-based semiconductor (RF CMOS, SiC and SiGe), and vacuum tube technology are available to the RF designer. Each of the RF technologies offers a distinct trade-off between cost, frequency, gain, large-scale integration, lifetime, linearity, noise figure, packaging, power handling, power consumption, reliability, ruggedness, size, supply voltage, switching time and weight.
This document discusses materials used for MEMS and microsystems, including substrates, active materials, and packaging materials. Common substrate materials include silicon, quartz, and various polymers. Silicon is discussed in detail due to its ideal properties as a substrate. Other materials covered include silicon compounds, piezoelectric crystals, and conductive polymers. The document concludes with a brief overview of packaging materials and methods.
The document provides information on VLSI technology course syllabus covering topics such as cleanroom technology, epitaxy, oxidation, diffusion, lithography, etching, and metallization. It discusses the creation of electronic grade silicon from sand through processes like reduction, purification, crystal growth via Czochralski method, wafer shaping through sawing and polishing to produce uniform thickness wafers ready for fabrication.
Micro-electromechanical systems (MEMS) combine mechanical and electrical components on a silicon chip using microfabrication techniques. MEMS can sense, control, and actuate on a microscale and generate macroscale effects. Common MEMS fabrication techniques include deposition, patterning, etching, and micromachining of materials like silicon and metals. There are three main micromachining methods: bulk micromachining which removes silicon substrate material, surface micromachining which builds up thin films, and high-aspect-ratio micromachining (HARM) which allows molding of high-resolution microstructures. LIGA is a specialized HARM technique that uses x-rays to pattern thick photoresist
The document provides an overview of integrated circuit fabrication processes. It discusses the basic steps including wafer production, epitaxial growth, etching, masking, doping, diffusion, implantation, and metallization. It also describes the fabrication processes for MOSFETs including NMOS, PMOS and CMOS. BiCMOS fabrication is also summarized, which combines BJT and CMOS processes to achieve high speed and low power benefits.
Metallic micro lattices are a new class of synthetic porous material that combines useful mechanical properties of metals with optimized geometric structures. They consist of micro-scale struts arranged in different lattice patterns and can be manufactured using additive manufacturing techniques. Metallic micro lattices provide greater stiffness and strength compared to solid metals due to their low density, ability to absorb impact energy, and potential to recover their original shape. They have applications in aerospace, automotive, and other structural engineering fields due to their mechanical properties and lightweight nature.
Classification of Engineering Materials, Engineering requirements of materials. Akash Patel
- Materials can be divided into two main classes: crystalline and non-crystalline. The key materials classes discussed are metals/metal alloys, ceramics, semiconductors, polymers, and composites.
- Metals/alloys make up the largest proportion of materials by quantity and value, with steels being the most prevalent alloy. Ceramics range from soft to very hard materials. Semiconductors are foundational to electronics. Polymers are used to create plastics. Composites combine materials for specific properties.
- When selecting materials, key engineering requirements include the material's ability to be fabricated, suitability for the service conditions, and possession of appropriate mechanical, chemical
Silicon Carbide in Microsystem Technology — Thin Film Versus Bulk MaterialMariana Amorim Fraga
Mariana Amorim Fraga, Matteo Bosi and Marco Negri (2015). Silicon Carbide in Microsystem Technology — Thin Film Versus Bulk Material, Advanced Silicon Carbide Devices and Processing, Dr. Stephen Saddow (Ed.), InTech, DOI: 10.5772/60970. Available from: https://www.intechopen.com/books/advanced-silicon-carbide-devices-and-processing/silicon-carbide-in-microsystem-technology-thin-film-versus-bulk-material
Introduction about semiconductors and their integration with nanomaterialAbhay Rajput
1)What is Semiconductor?
2)Use of Semiconductor in different sectors.
3)Manufacturing Process
4)Types
5)Semiconductor Nanomaterial process
6)Properties
Material science and engineering is an interdisciplinary field that develops new materials and improves existing ones by understanding microstructure-composition-processing relationships. The field studies how a material's structure, synthesis, and processing affect its properties. Material scientists focus on underlying relationships between synthesis, processing, structure and properties, while material engineers translate materials into useful devices by controlling synthesis and processing to achieve desired structures and properties.
118CR0678-Tribological Study of Polymer-Ceramic Composites.pptxBirendraNag2
This document summarizes a tribology study of polymer-ceramic composites. It discusses that polymer-ceramic composites are made of ceramic fillers in a polymer matrix, often poly siloxanes. They can be formed using plastic processes and have properties like high fracture toughness, heat stability and low friction. The document discusses preparation methods, examples, types of composites, the polymer to ceramic transformation process, applications like coatings and microcomponents, and concludes that carbon in the ceramic materials inhibits crystallization and improves properties.
The document discusses materials science and engineering. It provides information on different types of materials including metals, ceramics, polymers, composites, and semiconductors. It also discusses the structure-property relationships in materials and how their properties are determined by composition and processing methods. Assessment in the course is based on assignments, midterm exam, final exam, and other factors.
This document discusses different types of materials, including metals, polymers, ceramics, composites, and smart materials. It provides details on their key properties and examples. Metals are good conductors of heat and electricity, while polymers are made of long molecular chains that can be cross-linked. Ceramics are inorganic materials made by heating materials like silica and clay. Composites have improved properties from combining materials with a matrix and reinforce. Smart materials change properties in response to stimuli like stress, temperature, or electric fields.
Nanomaterials are materials that have at least one dimension between 1 and 100 nm. They exhibit different physical and chemical properties than bulk materials. Nanomaterials can be classified based on their origin as natural or artificial, and based on their dimensions as zero-dimensional (all dimensions nanoscale), one-dimensional (two dimensions nanoscale), two-dimensional (one dimension nanoscale), or three-dimensional (no dimensions nanoscale). Common fabrication methods include top-down processes that break down larger materials, and bottom-up processes like sol-gel synthesis that assemble smaller units into larger structures. Ball milling is another bottom-up method that uses grinding to reduce materials to the nanoscale.
This presentation classifies and describes different types of materials:
1) Metals and alloys which have high strength and conductivity but are brittle. Examples include steel, aluminum, and copper.
2) Ceramics like concrete and pottery which are strong under compression but brittle. Examples include refractories and sensors.
3) Polymers or plastics which have lower strength but are lightweight and resistant to chemicals. Examples include polyethylene and epoxy.
4) Semiconductors like silicon that have electrical properties between conductors and insulators, enabling transistors and circuits.
5) Composite materials that combine materials for new properties, like carbon fiber reinforced plastics in aircraft.
Material technology Newly develpoed engineering materialsMihir Taylor
This document discusses several newly developed engineering materials including lead zirconate titanate (PZT), zirconium dioxide (ZrO2), amorphous silicon, and magneto rheological fluid. PZT is a piezoelectric ceramic used in sensors and actuators due to its ability to generate voltage or change shape with electric fields or temperature changes. ZrO2 is a ceramic material that can be stabilized in different crystal phases for uses like thermal barriers or insulators. Amorphous silicon lacks a crystalline structure but can be used in devices like thin-film transistors and solar cells when hydrogenated. Magneto rheological fluid increases viscosity when exposed to magnetic fields, allowing controllable damp
Elastomers are polymers that can undergo large elastic deformations when force is applied and then quickly recover their original shape when the force is removed. Their molecular chains are coiled like springs. When force is applied, the chains uncoil and stretch the material. Upon release of force, the chains recoil back to the original shape. Crosslinking the chains restricts viscous flow under force and allows the material to retain its elastic properties after many stretch-release cycles. The elasticity of an elastomer can be controlled by the amount of crosslinking, with more crosslinks producing a harder, stiffer material.
Compare alloys with microcrystalline grains and nanocrystalline grai.pdfinfoeyecare
Compare alloys with microcrystalline grains and nanocrystalline grains in 800 words
Solution
Alloy
Nanocrystalline
Microcrystalline
1. An alloy is a mixture of metals or a mixture of a metal and another element. Alloys are
defined by metallic bonding character.[1] An alloy may be a solid solution of metal elements (a
single phase) or a mixture of metallic phases (two or more solutions). Intermetallic compounds
are alloys with a defined stoichiometry and crystal structure. Zintl phases are also sometimes
considered alloys depending on bond types (see also: Van Arkel-Ketelaar triangle for
information on classifying bonding in binary compounds).
2. Alloys are used in a wide variety of applications. In some cases, a combination of metals
may reduce the overall cost of the material while preserving important properties. In other cases,
the combination of metals imparts synergistic properties to the constituent metal elements such
as corrosion resistance or mechanical strength. Examples of alloys are steel, solder, brass,
pewter, duralumin, phosphor bronze and amalgams.
3. The alloy constituents are usually measured by mass. Alloys are usually classified as
substitutional or interstitial alloys, depending on the atomic arrangement that forms the alloy.
They can be further classified as homogeneous (consisting of a single phase), or heterogeneous
(consisting of two or more phases) or intermetallic.
4. The components of various alloys contain metallic and non-metallic elements. There are a
large number of possible combination of different metals and each has its own specific set of
properties. The Uses for alloys are limitless depending on the materials involved and the
complexity of the alloy. The alloys are used extensively in fields that involve but are not limited
to; aircrafts, military, commercial, industrial, medical, residential and manufacturing
applications. Alloys like Aluminium, Copper, Nickel, Stainless steel, Titanium all have different
uses in various applications.
1. Nanocrystalline silicon (nc-Si), sometimes also known as microcrystalline silicon (c-Si),
is a form of porous silicon.[1] It is an allotropic form of silicon with paracrystalline structure—is
similar to amorphous silicon (a-Si), in that it has an amorphous phase. Where they differ,
however, is that nc-Si has small grains of crystalline silicon within the amorphous phase. This is
in contrast to polycrystalline silicon (poly-Si) which consists solely of crystalline silicon grains,
separated by grain boundaries. The difference comes solely from the grain size of the crystalline
grains. Most materials with grains in the micrometer range are actually fine-grained polysilicon,
so nanocrystalline silicon is a better term. The term Nanocrystalline silicon refers to a range of
materials around the transition region from amorphous to microcrystalline phase in the silicon
thin film. The crystalline volume fraction (as measured from Raman spectroscopy) is another
criterion to describ.
The document discusses silicon crystal growth from melt using the Czochralski technique. It explains that high purity electronic grade silicon is used as the raw material. In the Czochralski process, silicon is melted in a crucible and a seed crystal is dipped into the melt and slowly extracted, allowing a single crystal ingot to form. The crystal is then sliced into wafers, which are used to produce microchips and other silicon devices. Key steps include purifying metallurgical grade silicon, controlling the furnace atmosphere, and precisely controlling the pull rate and crystal orientation.
This document discusses various advanced engineering materials. It begins by introducing metallic glasses, including their types, preparation methods, properties, and applications. It then discusses shape memory alloys, including temperature-induced transformation, stress-induced transformation, shape memory effect, super elasticity, types, applications, advantages, and disadvantages. Finally, it briefly introduces biomaterials and ultracapacitors, including their principles and types.
MEMS micro electro mechanical systems is an advanced field of engineering which has many scientific applications.
This PPT summarizes about mems, the materials used in mems, materials used in mems, their uses, pros and cons, advantages disadvantages etc..
A review about various types of solar panelsRanjuRajan3
The document summarizes information about flexible solar panels. Flexible solar panels are made from thin, lightweight, and flexible materials compared to traditional rigid panels. They can be installed on curved surfaces and rooftops without additional mounting hardware. The document discusses the materials used in flexible solar panels including flexible substrates like plastic and metal foils, as well as active semiconductor materials like amorphous silicon, CIGS, and organic semiconductors. It provides details on the working principles of flexible photovoltaic cells and the basic structure of a flexible solar cell.
How is a silicon substrate helpful to the electronics industry? What is it?wafer pro
A semiconductor material that is extremely flat is used to make silicon substrate. It can be produced in a variety of ways, including the Float Zone (FZ) growing method and the Czochralski (CZ) pulling method.
https://waferpro.com/what-is-a-silicon-wafer/
undamentals of Crystal Structure: BCC, FCC and HCP Structures, coordination number and atomic packing factors, crystal imperfections -point line and surface imperfections. Atomic Diffusion: Phenomenon, Fick’s laws of diffusion, factors affecting diffusion.
Metallic glasses are amorphous metals formed through rapid cooling of molten metal alloys to prevent crystallization. There are two types: metal-metal and metal-metalloid. Shape memory alloys can remember and recover their original shape after deformation through heating or cooling via a solid-solid phase transformation. Nitinol, a nickel-titanium alloy, is a commonly used shape memory alloy with applications in medical devices like bone plates and catheters due to its biocompatibility and pseudoelastic properties. Both metallic glasses and shape memory alloys show promise for various applications through their unique material properties.
1) Diamond chips or carbon chips are electronic chips manufactured using carbon or diamond as the substrate material instead of silicon. Carbon nanotubes are a major component used in carbon chips.
2) Carbon has advantages over silicon such as higher thermal conductivity, ability to withstand higher voltages and temperatures. However, carbon chips are still more expensive than silicon chips and electricity does not flow as smoothly through diamond as silicon.
3) Research is ongoing to address these issues and fully utilize the properties of carbon nanotubes and diamond film for applications like power electronics where their properties would provide benefits over silicon. Carbon chips are not expected to completely replace silicon for at least 20 more years.
This document discusses integrated circuits (ICs). It provides a brief history starting from the 1940s and covers the scale of integration from small to ultra-large scale. The key types of ICs and wafer fabrication process involving shaping, etching, cleaning and film deposition are summarized. The advantages of ICs include their small size, low weight and high speed. Applications include automobiles, appliances and computers.
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%.
Silicon Carbide in Microsystem Technology — Thin Film Versus Bulk MaterialMariana Amorim Fraga
Mariana Amorim Fraga, Matteo Bosi and Marco Negri (2015). Silicon Carbide in Microsystem Technology — Thin Film Versus Bulk Material, Advanced Silicon Carbide Devices and Processing, Dr. Stephen Saddow (Ed.), InTech, DOI: 10.5772/60970. Available from: https://www.intechopen.com/books/advanced-silicon-carbide-devices-and-processing/silicon-carbide-in-microsystem-technology-thin-film-versus-bulk-material
Introduction about semiconductors and their integration with nanomaterialAbhay Rajput
1)What is Semiconductor?
2)Use of Semiconductor in different sectors.
3)Manufacturing Process
4)Types
5)Semiconductor Nanomaterial process
6)Properties
Material science and engineering is an interdisciplinary field that develops new materials and improves existing ones by understanding microstructure-composition-processing relationships. The field studies how a material's structure, synthesis, and processing affect its properties. Material scientists focus on underlying relationships between synthesis, processing, structure and properties, while material engineers translate materials into useful devices by controlling synthesis and processing to achieve desired structures and properties.
118CR0678-Tribological Study of Polymer-Ceramic Composites.pptxBirendraNag2
This document summarizes a tribology study of polymer-ceramic composites. It discusses that polymer-ceramic composites are made of ceramic fillers in a polymer matrix, often poly siloxanes. They can be formed using plastic processes and have properties like high fracture toughness, heat stability and low friction. The document discusses preparation methods, examples, types of composites, the polymer to ceramic transformation process, applications like coatings and microcomponents, and concludes that carbon in the ceramic materials inhibits crystallization and improves properties.
The document discusses materials science and engineering. It provides information on different types of materials including metals, ceramics, polymers, composites, and semiconductors. It also discusses the structure-property relationships in materials and how their properties are determined by composition and processing methods. Assessment in the course is based on assignments, midterm exam, final exam, and other factors.
This document discusses different types of materials, including metals, polymers, ceramics, composites, and smart materials. It provides details on their key properties and examples. Metals are good conductors of heat and electricity, while polymers are made of long molecular chains that can be cross-linked. Ceramics are inorganic materials made by heating materials like silica and clay. Composites have improved properties from combining materials with a matrix and reinforce. Smart materials change properties in response to stimuli like stress, temperature, or electric fields.
Nanomaterials are materials that have at least one dimension between 1 and 100 nm. They exhibit different physical and chemical properties than bulk materials. Nanomaterials can be classified based on their origin as natural or artificial, and based on their dimensions as zero-dimensional (all dimensions nanoscale), one-dimensional (two dimensions nanoscale), two-dimensional (one dimension nanoscale), or three-dimensional (no dimensions nanoscale). Common fabrication methods include top-down processes that break down larger materials, and bottom-up processes like sol-gel synthesis that assemble smaller units into larger structures. Ball milling is another bottom-up method that uses grinding to reduce materials to the nanoscale.
This presentation classifies and describes different types of materials:
1) Metals and alloys which have high strength and conductivity but are brittle. Examples include steel, aluminum, and copper.
2) Ceramics like concrete and pottery which are strong under compression but brittle. Examples include refractories and sensors.
3) Polymers or plastics which have lower strength but are lightweight and resistant to chemicals. Examples include polyethylene and epoxy.
4) Semiconductors like silicon that have electrical properties between conductors and insulators, enabling transistors and circuits.
5) Composite materials that combine materials for new properties, like carbon fiber reinforced plastics in aircraft.
Material technology Newly develpoed engineering materialsMihir Taylor
This document discusses several newly developed engineering materials including lead zirconate titanate (PZT), zirconium dioxide (ZrO2), amorphous silicon, and magneto rheological fluid. PZT is a piezoelectric ceramic used in sensors and actuators due to its ability to generate voltage or change shape with electric fields or temperature changes. ZrO2 is a ceramic material that can be stabilized in different crystal phases for uses like thermal barriers or insulators. Amorphous silicon lacks a crystalline structure but can be used in devices like thin-film transistors and solar cells when hydrogenated. Magneto rheological fluid increases viscosity when exposed to magnetic fields, allowing controllable damp
Elastomers are polymers that can undergo large elastic deformations when force is applied and then quickly recover their original shape when the force is removed. Their molecular chains are coiled like springs. When force is applied, the chains uncoil and stretch the material. Upon release of force, the chains recoil back to the original shape. Crosslinking the chains restricts viscous flow under force and allows the material to retain its elastic properties after many stretch-release cycles. The elasticity of an elastomer can be controlled by the amount of crosslinking, with more crosslinks producing a harder, stiffer material.
Compare alloys with microcrystalline grains and nanocrystalline grai.pdfinfoeyecare
Compare alloys with microcrystalline grains and nanocrystalline grains in 800 words
Solution
Alloy
Nanocrystalline
Microcrystalline
1. An alloy is a mixture of metals or a mixture of a metal and another element. Alloys are
defined by metallic bonding character.[1] An alloy may be a solid solution of metal elements (a
single phase) or a mixture of metallic phases (two or more solutions). Intermetallic compounds
are alloys with a defined stoichiometry and crystal structure. Zintl phases are also sometimes
considered alloys depending on bond types (see also: Van Arkel-Ketelaar triangle for
information on classifying bonding in binary compounds).
2. Alloys are used in a wide variety of applications. In some cases, a combination of metals
may reduce the overall cost of the material while preserving important properties. In other cases,
the combination of metals imparts synergistic properties to the constituent metal elements such
as corrosion resistance or mechanical strength. Examples of alloys are steel, solder, brass,
pewter, duralumin, phosphor bronze and amalgams.
3. The alloy constituents are usually measured by mass. Alloys are usually classified as
substitutional or interstitial alloys, depending on the atomic arrangement that forms the alloy.
They can be further classified as homogeneous (consisting of a single phase), or heterogeneous
(consisting of two or more phases) or intermetallic.
4. The components of various alloys contain metallic and non-metallic elements. There are a
large number of possible combination of different metals and each has its own specific set of
properties. The Uses for alloys are limitless depending on the materials involved and the
complexity of the alloy. The alloys are used extensively in fields that involve but are not limited
to; aircrafts, military, commercial, industrial, medical, residential and manufacturing
applications. Alloys like Aluminium, Copper, Nickel, Stainless steel, Titanium all have different
uses in various applications.
1. Nanocrystalline silicon (nc-Si), sometimes also known as microcrystalline silicon (c-Si),
is a form of porous silicon.[1] It is an allotropic form of silicon with paracrystalline structure—is
similar to amorphous silicon (a-Si), in that it has an amorphous phase. Where they differ,
however, is that nc-Si has small grains of crystalline silicon within the amorphous phase. This is
in contrast to polycrystalline silicon (poly-Si) which consists solely of crystalline silicon grains,
separated by grain boundaries. The difference comes solely from the grain size of the crystalline
grains. Most materials with grains in the micrometer range are actually fine-grained polysilicon,
so nanocrystalline silicon is a better term. The term Nanocrystalline silicon refers to a range of
materials around the transition region from amorphous to microcrystalline phase in the silicon
thin film. The crystalline volume fraction (as measured from Raman spectroscopy) is another
criterion to describ.
The document discusses silicon crystal growth from melt using the Czochralski technique. It explains that high purity electronic grade silicon is used as the raw material. In the Czochralski process, silicon is melted in a crucible and a seed crystal is dipped into the melt and slowly extracted, allowing a single crystal ingot to form. The crystal is then sliced into wafers, which are used to produce microchips and other silicon devices. Key steps include purifying metallurgical grade silicon, controlling the furnace atmosphere, and precisely controlling the pull rate and crystal orientation.
This document discusses various advanced engineering materials. It begins by introducing metallic glasses, including their types, preparation methods, properties, and applications. It then discusses shape memory alloys, including temperature-induced transformation, stress-induced transformation, shape memory effect, super elasticity, types, applications, advantages, and disadvantages. Finally, it briefly introduces biomaterials and ultracapacitors, including their principles and types.
MEMS micro electro mechanical systems is an advanced field of engineering which has many scientific applications.
This PPT summarizes about mems, the materials used in mems, materials used in mems, their uses, pros and cons, advantages disadvantages etc..
A review about various types of solar panelsRanjuRajan3
The document summarizes information about flexible solar panels. Flexible solar panels are made from thin, lightweight, and flexible materials compared to traditional rigid panels. They can be installed on curved surfaces and rooftops without additional mounting hardware. The document discusses the materials used in flexible solar panels including flexible substrates like plastic and metal foils, as well as active semiconductor materials like amorphous silicon, CIGS, and organic semiconductors. It provides details on the working principles of flexible photovoltaic cells and the basic structure of a flexible solar cell.
How is a silicon substrate helpful to the electronics industry? What is it?wafer pro
A semiconductor material that is extremely flat is used to make silicon substrate. It can be produced in a variety of ways, including the Float Zone (FZ) growing method and the Czochralski (CZ) pulling method.
https://waferpro.com/what-is-a-silicon-wafer/
undamentals of Crystal Structure: BCC, FCC and HCP Structures, coordination number and atomic packing factors, crystal imperfections -point line and surface imperfections. Atomic Diffusion: Phenomenon, Fick’s laws of diffusion, factors affecting diffusion.
Metallic glasses are amorphous metals formed through rapid cooling of molten metal alloys to prevent crystallization. There are two types: metal-metal and metal-metalloid. Shape memory alloys can remember and recover their original shape after deformation through heating or cooling via a solid-solid phase transformation. Nitinol, a nickel-titanium alloy, is a commonly used shape memory alloy with applications in medical devices like bone plates and catheters due to its biocompatibility and pseudoelastic properties. Both metallic glasses and shape memory alloys show promise for various applications through their unique material properties.
1) Diamond chips or carbon chips are electronic chips manufactured using carbon or diamond as the substrate material instead of silicon. Carbon nanotubes are a major component used in carbon chips.
2) Carbon has advantages over silicon such as higher thermal conductivity, ability to withstand higher voltages and temperatures. However, carbon chips are still more expensive than silicon chips and electricity does not flow as smoothly through diamond as silicon.
3) Research is ongoing to address these issues and fully utilize the properties of carbon nanotubes and diamond film for applications like power electronics where their properties would provide benefits over silicon. Carbon chips are not expected to completely replace silicon for at least 20 more years.
This document discusses integrated circuits (ICs). It provides a brief history starting from the 1940s and covers the scale of integration from small to ultra-large scale. The key types of ICs and wafer fabrication process involving shaping, etching, cleaning and film deposition are summarized. The advantages of ICs include their small size, low weight and high speed. Applications include automobiles, appliances and computers.
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%.
Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapte...University of Maribor
Slides from talk presenting:
Aleš Zamuda: Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapter and Networking.
Presentation at IcETRAN 2024 session:
"Inter-Society Networking Panel GRSS/MTT-S/CIS
Panel Session: Promoting Connection and Cooperation"
IEEE Slovenia GRSS
IEEE Serbia and Montenegro MTT-S
IEEE Slovenia CIS
11TH INTERNATIONAL CONFERENCE ON ELECTRICAL, ELECTRONIC AND COMPUTING ENGINEERING
3-6 June 2024, Niš, Serbia
A SYSTEMATIC RISK ASSESSMENT APPROACH FOR SECURING THE SMART IRRIGATION SYSTEMSIJNSA Journal
The smart irrigation system represents an innovative approach to optimize water usage in agricultural and landscaping practices. The integration of cutting-edge technologies, including sensors, actuators, and data analysis, empowers this system to provide accurate monitoring and control of irrigation processes by leveraging real-time environmental conditions. The main objective of a smart irrigation system is to optimize water efficiency, minimize expenses, and foster the adoption of sustainable water management methods. This paper conducts a systematic risk assessment by exploring the key components/assets and their functionalities in the smart irrigation system. The crucial role of sensors in gathering data on soil moisture, weather patterns, and plant well-being is emphasized in this system. These sensors enable intelligent decision-making in irrigation scheduling and water distribution, leading to enhanced water efficiency and sustainable water management practices. Actuators enable automated control of irrigation devices, ensuring precise and targeted water delivery to plants. Additionally, the paper addresses the potential threat and vulnerabilities associated with smart irrigation systems. It discusses limitations of the system, such as power constraints and computational capabilities, and calculates the potential security risks. The paper suggests possible risk treatment methods for effective secure system operation. In conclusion, the paper emphasizes the significant benefits of implementing smart irrigation systems, including improved water conservation, increased crop yield, and reduced environmental impact. Additionally, based on the security analysis conducted, the paper recommends the implementation of countermeasures and security approaches to address vulnerabilities and ensure the integrity and reliability of the system. By incorporating these measures, smart irrigation technology can revolutionize water management practices in agriculture, promoting sustainability, resource efficiency, and safeguarding against potential security threats.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
Harnessing WebAssembly for Real-time Stateless Streaming PipelinesChristina Lin
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
A review on techniques and modelling methodologies used for checking electrom...nooriasukmaningtyas
The proper function of the integrated circuit (IC) in an inhibiting electromagnetic environment has always been a serious concern throughout the decades of revolution in the world of electronics, from disjunct devices to today’s integrated circuit technology, where billions of transistors are combined on a single chip. The automotive industry and smart vehicles in particular, are confronting design issues such as being prone to electromagnetic interference (EMI). Electronic control devices calculate incorrect outputs because of EMI and sensors give misleading values which can prove fatal in case of automotives. In this paper, the authors have non exhaustively tried to review research work concerned with the investigation of EMI in ICs and prediction of this EMI using various modelling methodologies and measurement setups.
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
2. Session Objectives
To introduce the advantage and role of silicon in MEMS
device.
To study about various silicon compounds.
To identify the role of polymers in MEMS design.
To know the usage of metals at various levels of
fabrication.
3. Session Outcomes
At the end of the session, students will be able to
Understand the importance of Si and its components.
Know applications of polymers and metals.
5. Materials for MEMS
• Substrates and wafers
• Flat microscopic objects in which
microfabrication takes place
• Single crystal cut in slices from a larger piece
called wafer
7. Silicon – an ideal substrate material for
MEMS
• Si is the most abundant material
• Single crystal silicon is the most widely used substrate material for
MEMS and microsystems.
• The popularity of silicon for such application is primarily for the
following reasons:
(1) It is mechanically stable
(2) p or n-type piezoresistive can be readily integrated with the Si
substrate-ideal for transistors.
(3) Has same Young’s modulus as steel (∼ 2x105 MPa), but is as light
as aluminum with a density of about 2.3 g/cm3.
8. Silicon – an ideal substrate material
for MEMS-Cont’d
(1) It has a melting point at 1400oC. This high melting point
makes silicon dimensionally stable
(2) Its thermal expansion coefficient is about 8 times smaller than
that of steel, and is more than 10 times smaller than that of
aluminum.
(3) No mechanical hysteresis.
(4) Extremely flat for coatings and additional thin film layers
(5) Greater flexibility in design and manufacture
9. Single-Crystal Silicon
• For silicon to be used as a substrate material in integrated
circuits and MEMS, it has to be in a pure single-crystal form.
• The most commonly used method of producing single-crystal
silicon is the Czochralski (CZ) method.
10. The Czochralski method for
producing single-crystal silicon
Procedure:
(1) Raw Si (quartzite) + coal, coke,
woodchips) are melted in the
crucible.
(2) A “seed” crystal is brought to be in
contact with molten Si
(3) The “puller” slowly pulls the molten
Si up to form pure Si “boule”
(4) The diameters of the “bologna-like”
boules vary from 100 mm (4”) to 300
mm (12”) in diameters.
Equipment: a crucible and a “puller”.
Chemical reaction for the process: SiC + SiO2 → Si + CO + SiO
11. Pure silicon wafers
• Pure silicon boules of 300 mm diameter and 30 ft long, can
weigh up to 400 Kg.
• These boules are sliced into thin disks (wafers) using diamond
saws.
• Standard sizes of wafers are:
100 mm (4”) diameter x 500 μm thick.
150 mm (6”) diameter x 750 μm thick.
200 mm (8”) diameter x 1 mm thick
300 mm (12”) diameter x 750 μm thick
12. Single Silicon Crystal Structure
• Single silicon crystals are basically of “face-cubic-center”
(FCC) structure.
• The crystal structure of a typical FCC crystal is shown below:
Note: Total number of atoms: 8 at corners and 6 at faces = 14
atoms
13. Single Silicon Crystal Structure
• Single crystal silicon, however has 4 extra atoms in the
interior.
• The situation is like to merge two FCC crystals together as
shown below:
Total no. of atoms in a single silicon crystal = 18.
14. The Miller Indices
• Miller indices are commonly use to describe the faces of
crystalline materials
● A plane intersects x, y and z-coordinates at a, b
and c.
● A point on the plane located at P(x,y,z)
● The equation defines the P(x,y,z) is:
in a different form:
in which h = 1/a, k = 1/b and m = 1/c.
● Miller indices involve:
(hkm) = designation of a “face”, or a plane;
<hkm> = designation of a direction that is perpendicular to the (hkm) plane.
● NOTE: In a cubic crystal, such as silicon, a = b = c = 1
18. Silicon compounds
• There are 3 principal silicon compounds used in
MEMS and microsystems: Silicon dioxide (SiO2),
Silicon carbide (SiC) and silicon nitride (Si3N4) –
each has distinct characteristic and unique
applications.
• Poly crystalline silicon
19. Silicon dioxide (SiO2)
● It is least expensive material to offer good thermal and
electrical insulation.
● Also used a low-cost material for “masks” in micro fabrication
processes such as etching, deposition and diffusion.
● Used as sacrificial material in “surface micromachining”.
● Above all, it is very easy to produce:
- by dry heating of silicon: Si + O2 → SiO2
- or by oxide silicon in wet steam: Si + 2H2O → SiO2 + 2H2
20. Silicon carbide (SiC)
• High melting point
• Resistance to chemical reactions
• Ideal candidate material for being masks in micro
fabrication processes.
• It has superior dimensional stability
21. Silicon nitride (Si3N4)
● Produced by chemical reaction:
3SiCl2H2 + 4NH3 → Si3N4 + 6HCL + 6H2
● Used as excellent barrier to diffusion to water
and ions.
● Its ultra strong resistance to oxidation and many
etchants make it a superior material for masks in
deep etching.
● Also used as high strength electric insulators.
23. Polycrystalline silicon
● It is usually called “Polysilicon”.
● It is an aggregation of pure silicon crystals
with randomly orientations deposited on the
top of silicon substrates:
These polysilicon usually are highly doped silicon.
● They are deposited to the substrate surfaces to produce localized “resistors” and
“gates for transistors”
● Being randomly oriented, polysilicon is even stronger than single silicon crystals.
26. Polymers
What is polymer?
Polymers include: Plastics, adhesives, Plexiglass and Lucite.
Principal applications of polymers in MEMS:
● Currently in biomedical applications and adhesive bonding.
● As substrates with electric conductivity made possible by doping.
Molecular structure of polymers:
● It is made up of long chains of organic (hydrocarbon) molecules.
● The molecules can be as long as a few hundred nm.
Characteristics of polymers:
● Low melting point; Poor electric conductivity
● Thermoplastics and thermosets are common industrial products
● Thermoplastics are easier to form into shapes.
● Thermosets have higher mechanical strength even at temperature up
to 350oC.
27. Polymers as industrial materials
Polymers are popular materials used for many industrial
products for the following advantages:
• Light weight
• Ease in processing
• Low cost of raw materials and processes for producing
polymers
• High corrosion resistance
• High electrical resistance
• High flexibility in structures
• High dimensional stability
28. Polymers for MEMS and microsystems
(1) Photo-resist polymers are used to produce masks for creating
desired patterns on substrates by photolithography technique.
(2) The same photoresist polymers are used to produce the prime
mold with desirable geometry of the MEMS components in a
LIGA process in micro manufacturing.
(3) Conductive polymers are used as “organic” substrates for
MEMS and microsystems.
(4) The ferroelectric polymers that behave like piezoelectric
crystals can be used as the source of actuation in micro devices
such as in micro pumping.
(5) The thin Langmuir-Blodgett (LB) films can be used to
produce multilayer microstructures.
29. Polymers for MEMS and microsystems
(6) Polymers with unique characteristics are used as coating
substance to capillary tubes to facilitate effective electro-
osmotic flow in microfluidics.
(7) Thin polymer films are used as electric insulators in micro
devices, and as dielectric substance in micro capacitors.
(8) They are widely used for electromagnetic interference (EMI)
and radio frequency interference (RFI) shielding in
microsystems.
(9) Polymers are ideal materials for encapsulation of micro
sensors and the packaging of other microsystems.
30. Conductive Polymers
● Polymers are poor electric conducting materials by nature.
● A comparison of electric conductivity of selected materials are:
Materials Electric Conductivity, S/m*
• Conductors:
– Copper, Cu
– Carbon
• Semiconductors:
– Germanium, Ge
– Silicon
• Insulators:
– Glass
– Nylon
– SiO2
– Polyethlene
106-108
104
100
10-4-10-2
10-10-10-8
10-14-10-12
10-16-10-14
10-16-10-14
* S/m = siemens per
meter = Ω-1 = A2-
s3/Kg-m2
31. Conductive Polymers – Cont’d
Some polymers can be made electrically conductive by the
following 3 methods:
33. Metals
• Gold, Aluminium- lead wires and ohmic contacts
• stainless steel-casing
• tin-lead, copper-solder alloys
• Copper, Aluminium- metal layer sputtering
34. Summary
• Silicon the most abundant and used substrate material.
• Commonly used method of producing single-crystal
silicon is the Czochralski (CZ) method.
• There are 3 principal silicon compounds used in MEMS
and microsystems: Silicon dioxide (SiO2), Silicon carbide
(SiC) and silicon nitride (Si3N4) – each has distinct
characteristic and unique applications.
• Polymer is good thermal and electrical insulator.
• Metals are used for casing, interconnects and contacts.
35. Test Your Understanding
• Explain the Czochralski (CZ) method in detail.
• Create a table listing various polymers and its role in
MEMS device.
• Identify various materials used in the fabrication of
MEMS/NEMS devices.