Semiconductors
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An introduction to semiconductors, their properties, and applications. It discusses the conductivity and resistance of semiconductors, doping, pn junctions, and diodes. It also covers topics such as LED, transistors, and amplifiers. equations and examples to help understand the concepts.
Typology: Lecture notes
2022/2023
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Semiconductors
At 0K, highest energy of the outermost shell(valence bond) is defined as fermi energy.
A doped semiconductor has impurity level 30 meV below
the conduction band
(a) find the order of temperature at which electron is just
able to jump from donor level to conduction band.
(b) Find wavelength of radiation that should be incident
on it, so that large number of free electrons are created.
Example:
If resistivity of pure Silicon is 300 ohm-m and
find
(a) resistivity of N type semiconductor, if 10^19 Phosphorus are added per cubic meter.
(b) resistivity of P type semiconductor, if 2*10^19 B atoms are added per cubic meter.
current from P type to n type due to diffusion of electrons and holes