Band theory of solids
- Bloch theorem- Kronig Penny model - effective mass - velocity and acceleration of electrons in solids - Brillouin zones.
-Classification of solids: conductors - semiconductors and insulators.

Intrinsic and extrinsic semiconductors
- energy bands of electrons for intrinsic and extrinsic semiconductors - Fermi energy level - Carriers concentration in intrinsic and extrinsic semiconductors - Effect of temperature on semiconductor resistivity - Mobility and electrical conduction - Hall effect.

Contact phenomenon
contact between two different metals - P-n semiconductors junction - Rectification properties of p-n junction and its applications - Zener diode - Photodiode - Tunnel diode and transistors.