Energy Bands in Semiconductors💥Metals, Insulators & semiconductors 🎯Part 1/3 Chap 14 Semiconductors

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NCERT Class 12 Physics
CBSE Class 12 Physics
NCERT Chapter 14 Semiconductor Electronics Materials, devices & Simple Circuits
Semiconductor Electronics
Classification of Metals, conductors & Semiconductors
Energy Band Theory for Semiconductors

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The energy band theory states that the allowed energy levels for electrons in a solid are not discrete, like in isolated atoms, but form continuous energy bands. These energy bands are formed by the overlapping of atomic orbitals as atoms come together to form a solid.

The energy bands in a solid are separated by forbidden energy gaps called band gaps. The two most important bands in this theory are the valence band and the conduction band:

1. Valence band: The valence band is the energy band that contains the highest energy levels occupied by electrons at absolute zero temperature. The electrons in the valence band are strongly bound to the atoms and are not available for electrical conduction. This band represents the filled electron states in a material.

2. Conduction band: The conduction band is the energy band located above the valence band. It contains vacant or loosely bound energy states. When an electron gains enough energy, typically through thermal excitation or the application of an external electric field, it can move from the valence band to the conduction band. Electrons in the conduction band are free to move throughout the material and contribute to electrical conductivity.

Chap 14 Part 1 Semiconductors

00:00:00 Introduction
00:04:36 electronic device
00:06:16 Types of electronic device
00:08:09 1. Vacuum tubes
00:13:36 2. solid state devices
00:18:44 Impact of solid-state devices
00:20:20 Classification of Solid on the Basis of their conductivity
00:24:42 Semiconductors
00:26:57 Classification of Semiconductors
00:30:04 Energy Bands in Solids
00:47:21 Formation of Energy Bands in Solids
01:02:33 Energy Bands in Solids
01:05:06 Difference between valence band, Conduction Band & Energy Bandgap
01:09:44 Difference between valence band, Conduction Band & Energy Bands
01:11:44 Distinction between Metals, Insulators & Semiconductors on the basis of Band Theory
01:17:11 Insulators on the basis of Band Theory
01:19:23 Distinction between Metals, Insulators & Semiconductors on the basis of Band Theory