# Solids and Semiconductors

## Fermi level in semiconductors

The concept of Fermi Level: In simple term, the Fermi level signifies the probability of occupation of energy levels in conduction band and valence band.

## How full wave rectifier operates

Let us discuss today the operation of full wave rectifier: In the full wave rectifier, two PN junction Diodes (say D1 and D2) a connected

## Half wave rectifier operation

Rectifier: A rectifier is a device that converts alternating current into direct current. Half wave rectifier: In this rectifier, the PN junction diode is connected

## How depletion layer or potential barrier is formed in the PN junction diode

In a PN junction diode holes are the majority carriers on P side whereas electrons are the majority carriers on n-side. The process of diffusion

## Difference between forward biasing and reverse biasing

To start the discussion of discussion of difference between forward biasing and reverse biasing, first of all let us discuss the meaning of PN junction

## Derivation of expression for the conductivity of a Semi-Conductor

Last time we have discussed the conductivity of semiconductor. Let us today derive the expression the expression for conductivity of semiconductor. In a Semi-Conductor

## How conductivity of semiconductor is increased

The conductivity of semiconductor can be increased by the following methods: 1. By doping: The addition of impurity atoms to a pure-semi-conductor is known as

## meaning of the term hole in a semi-conductor

Hole in a semiconductor: In a semi-conductor the energy gap is of the order of 1eV. At OK, the semi-conductor behaves like an insulator but

## Difference between n type semiconductor and p type semiconductor

We have already discussed about the concept of semiconductors, their types: intrinsic and extrinsic semiconductors, difference between intrinsic and extrinsic semiconductors and further types of

## Difference between intrinsic and extrinsic semiconductors

We have already discussed about the concept of semiconductors, their types: intrinsic and extrinsic semiconductors and further types of extrinsic semiconductors that are n type

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