From energy bands to logic gates.
Energy bands in solids and why metals, insulators and semiconductors differ, holes and intrinsic conduction, n-type and p-type doping, carrier densities, conductivity and temperature, the p-n junction and diode, dynamic resistance, photodiodes, LEDs and Zener diodes, rectifiers, junction transistors and amplifiers, oscillators, and logic gates up to the full adder.