Unit 1
Introduction to Semiconductor materials, Crystal Structure of Silicon and GaAs – Planes – directions – planes and planar atomic densities – Unit cell characteristics – Review of Quantum Mechanics – Dual Nature of Light and Electrons – Bohr model of atom, Uncertainty Principle – Time dependent and Time independent Schrodinger Wave equation – Infinite Potential well problem – Step Potential Function – Tunneling.
Unit 2
Molecular Orbital theory and formation of energy bands in semiconductors – Direct and Indirect band gap semiconductors – Charge carriers – Effective mass – Extrinsic and intrinsic semiconductors – Fermi Dirac Statistics and Fermi Level – Boltzman Statistics – Density of states – Equilibrium Carrier concentrations – Drift velocity and mobility – Temperature dependence of carrier concentration – mobility – and conductivity – Hall effect – Excess Carriers and photoconductivity – Diffusion of Carriers – Built in fields