20-03-2014, 12:59 PM
Introduction to Semiconductors & Its applications
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INTRODUCTION TO SEMICONDUCTORS
The magic word semiconductor is composed of two words-Semi and Conductor.
Semi means not completely while conductor mean something, which can conduct electricity.
A semiconductor is a material that has intermediate conductivity between a conductor and an insulator. It means that it has unique physical properties somewhere in between a conductor like aluminum and an insulator like glass
The definition of a semiconductor is a material that is neither a good conductor or a good insulator but that conducts more electricity when heat, light or voltage is added.
APPLICATIONS
Semiconductors are the foundation of modern electronics, including radio, computers, and telephones. Semiconductor-based electronic components include transistors, solar cells, many kinds of diodes including the light-emitting diode (LED), the silicon controlled rectifier, photo-diodes, and digital and analog integrated circuits.
Properties
Physical properties
The wurtzite structure is most stable at ambient conditions and thus most common. The zincblende form can be stabilized by growing ZnO on substrates with cubic lattice structure. In both cases, the zinc and oxide centers are tetrahedral.
Hexagonal and zincblende polymorphs have no inversion symmetry. This and other lattice symmetry properties result in piezoelectricity of the hexagonal and zincblende ZnO, and pyroelectricity of hexagonal ZnO.
Why FeZnO is interesting?
Widely used:
medicinal purposes (colds, rashes, antiseptics, sunscreen lotions)
used in manufacturing of rubber as rubber cure (or as filler)
pigment for paints and coatings
in electronics, used mainly in laser diodes, LED’s, transparent thin film coatings, and various piezoelectrics
Bright future:
shows promising signs in the field of nanotechnology, UV detecors, nanoscale detectors and actuators.
Sol-gel Advantages
Inexpensive and low temperature operation.
Very thin films of metal oxides can be obtained.
Uniform distribution of components and porosity.
Easy dopant addition in ceramics processing.
Sol gel material can be obtained as bulks, thin films, (nano) powders.
- Atomic level mixing of components(Precursors).
[attachment=60308]
INTRODUCTION TO SEMICONDUCTORS
The magic word semiconductor is composed of two words-Semi and Conductor.
Semi means not completely while conductor mean something, which can conduct electricity.
A semiconductor is a material that has intermediate conductivity between a conductor and an insulator. It means that it has unique physical properties somewhere in between a conductor like aluminum and an insulator like glass
The definition of a semiconductor is a material that is neither a good conductor or a good insulator but that conducts more electricity when heat, light or voltage is added.
APPLICATIONS
Semiconductors are the foundation of modern electronics, including radio, computers, and telephones. Semiconductor-based electronic components include transistors, solar cells, many kinds of diodes including the light-emitting diode (LED), the silicon controlled rectifier, photo-diodes, and digital and analog integrated circuits.
Properties
Physical properties
The wurtzite structure is most stable at ambient conditions and thus most common. The zincblende form can be stabilized by growing ZnO on substrates with cubic lattice structure. In both cases, the zinc and oxide centers are tetrahedral.
Hexagonal and zincblende polymorphs have no inversion symmetry. This and other lattice symmetry properties result in piezoelectricity of the hexagonal and zincblende ZnO, and pyroelectricity of hexagonal ZnO.
Why FeZnO is interesting?
Widely used:
medicinal purposes (colds, rashes, antiseptics, sunscreen lotions)
used in manufacturing of rubber as rubber cure (or as filler)
pigment for paints and coatings
in electronics, used mainly in laser diodes, LED’s, transparent thin film coatings, and various piezoelectrics
Bright future:
shows promising signs in the field of nanotechnology, UV detecors, nanoscale detectors and actuators.
Sol-gel Advantages
Inexpensive and low temperature operation.
Very thin films of metal oxides can be obtained.
Uniform distribution of components and porosity.
Easy dopant addition in ceramics processing.
Sol gel material can be obtained as bulks, thin films, (nano) powders.
- Atomic level mixing of components(Precursors).