Question

Distinguish between intrinsic and extrinsic semiconductors.

Answer 1

semiconductor

A semiconductor is a material whose conductivity lies between conductor & insulator.

Intrinsic semiconductor

Semiconductors that are chemically pure, in other words, free from impurities are termed intrinsic semiconductors.

Extrinsic semiconductor

1. Extrinsic semiconductors are those semiconductors that are doped with specific impurities.
2. The impurity changes the electrical properties of the semiconductor, making it more suitable for electronic devices like diodes and transistors.

Step 4: Difference between an intrinsic and extrinsic semiconductors

Intrinsic semiconductor	Extrinsic semiconductor
It is the pure type of semiconductor	It is the impure type of semiconductor
The density of electrons is equal to the density of holes in Intrinsic semiconductor.	The density of electrons is not equal to the density of holes in extrinsic semiconductors.
Its electrical conductivity is low	Its electrical conductivity is high
Its electrical conductivity dependence on temperature only	Its electrical conductivity depends on temperature as well as on the amount of impurity
Examples:$\mathrm{Si},\mathrm{Ge}$	Examples: $\mathrm{GaAs},\mathrm{GaP}$