From where the Fermi level sits in doped silicon to the P-N junction, diodes, Zener regulators and transistors, each worked through with real numbers. Start with the Fermi level, then the junction, then the devices built on it.
Electronic Devices is part of Section 3: Electronic Devices of the GATE 2027 EC syllabus, which lists:
Formation of energy bands in solids, energy bands in intrinsic and extrinsic semiconductors, equilibrium carrier concentration, direct and indirect band-gap semiconductors.
Carrier Transport: Diffusion current, drift current, mobility and resistivity, generation and recombination of carriers, Poisson and continuity equations.
P-N junction, Zener diode, BJT, MOS capacitor, MOSFET, scaling in MOSFETs, LED, photo diode and solar cell.