Semi conductors Physics

18HS0851

UNIT – I

 ELECTRONIC MATERIALS: Free electron theory, density of states and energy band diagrams – Energy bands in solids – E – K band diagram, direct and indirect band gaps, types of electronic materials : metals , semiconductors and insulators – occupation probability – Fermi level – effective mass .

UNIT – II

 SEMICONDUCTORS: Intrinsic and Extrinsic semiconductors – Dependence of Fermi level on carrier-concentration and temperature (equilibrium carrier statistics) – Carrier generation and recombination – Carrier transport: diffusion and drift -Hall Effect- p -n junction – Metal semiconductors junction-Ohmic and Schottky Junctions.

UNIT –III 

LIGHTEMITING DIODE (LED) & PHOTODETECTORS: Rate equations for carrier density – radiative and non – radiative recombination mechanisms in semiconductors – LED: structure, materials, characteristics and figure of merits. Photo detectors – PIN and Avalanche diode and their structure, materials working principle and characteristics – Solar cell.- Principle and characteristics

UNIT – IV 

LASERS AND FIBER OPTICS: Characteristics of laser beams,Einstein’s theory of matter radiation interaction and A and B coefficients; amplification of light by population inversion, different types of lasers: Semiconductor laser, applications of lasers in science, engineering and medicine. Principle of fiber optics – acceptance angle and numerical aperture – types of fibre cables- loses in fiber optics – optical fiber communication system – applications of fiber optics.

UNIT-V

 PHYSICS OF NANOMATERIALS: Introduction, significance of nano scale – surface area and quantum confinement- Quantum dot, Quantum well , Quantum wire -Synthesis of nanomaterials- Top Down Process- Ball Milling ; Bottom Up Process: Sol-Gel method– CNT-Properties of Graphene- Applications.

  Text books: 1. J. Singh, Semiconductor optoelectronics, Physics and Technology, McGraw-Hill Inc. (1995). 2. S.M. Sze, Semiconductor devices: Physics and Technology, Wiley (2008). 3. P. Bhattacharya, Semiconductor optoelectronic devices, Prentice Hall of India (1997). 4. B.E.A. Saleh and M.C, Tech, Fundamentals of photonics, John Wiley & Sons. 5. Engineering Physics – K.Thyagarajan, MCGrawHill Education Private Ltd, New Delhi. 

Study Material's for Subject

2 marks questions :View/Download

Unit-1:-View/download

Unit-2:-View/download

Unit-3:-View/download

Unit-4:-LASERS: View/download

              FIBER OPTICS:View/download

Unit-5:-View/download

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