# Category Archives: Solids and Semiconductors

## Fermi level in semiconductors

Concept of Fermi Level: In simple term, the Fermi level signify 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 in the circuit. A load resistance (RL) is connected in the circuit across which the … Continue reading

## 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 to an input AC supply with the help of a primary coil, which will induce … Continue reading

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## 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 takes place due to which the majority carriers diffuse from one region to the other … Continue reading

## 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 diode and biasing:  The combination of the p-type material or semi-conductor with the n-type semi-conductor … Continue reading

## 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 of length (ℓ) and area of Cross-Section. Let ne and nh be the no. of … Continue reading

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## 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 doping. The doping is done to increase the conductivity of a pure semi-conductor. It must … Continue reading

## 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 at room temp the electrons acquire sufficient energy to jump to the conductor band thereby … Continue reading