Semiconductor Electronics L1💾 Semiconductors & PN Junction diode | Class 12 | JEE 2022 | Shreyas Sir

Introduction to semiconductors, the p-n junction diode, and their applications in physics. Importance of the topic for various exams like JEE mains, NEET, and boards. Overview of the energy band formation, energy gap, and classification of semiconductors.

Explanation of energy band formation in semiconductors. Discussion on valence bands, conduction bands, and the energy gap between them. Detailed explanation of how electrons move within the energy levels in a semiconductor.

Explanation of intrinsic and extrinsic semiconductors. Detailed discussion on how impurities are added to semiconductors to alter their conductivity. Overview of p-type and n-type semiconductors and the impact of impurities on electron and hole concentrations.

Explanation of the mobility and conductivity of semiconductors. Derivation of the formula for conductivity in semiconductors, considering electron and hole concentrations, and their respective mobilities. Importance of understanding mobility and conductivity in semiconductor devices.

Calculating resistivity using the formula 1/sigma.

Explaining the concept of p-type and n-type in a PN junction and their characteristics.

Discussing the diffusion and drift currents in a PN junction and how they contribute to the flow of charge carriers.

Explaining the concepts of forward and reverse bias in a PN junction and their effects on current flow.

Understanding the IV characteristics of a PN junction diode and the relationship between voltage and current.

Introducing dynamic resistance in semiconductors and how it differs from static resistance.

Explaining how a diode conducts electricity in one direction and its symbol representation.

Solving practice questions related to PN junctions, biasing, IV characteristics, and diode circuits.