Difference between an intrinsic and extrinsic semiconductor

A semiconductor is a material that has conductivity in between conductor and insulator. Semiconductor conducts less than the conductor and more than the insulator.

Semiconductors are of two types one is an intrinsic semiconductor or pure semiconductor and the other is an extrinsic semiconductor or impure semiconductor.

Now, let’s understand a few things about intrinsic semiconductor and extrinsic semiconductor

Intrinsic semiconductor

Intrinsic semiconductors are the type of semiconductor in which no impurities are added. Silicon, germanium is the most commonly used material as an intrinsic semiconductor.

It is also known as a pure semiconductor.

Extrinsic semiconductor

Semiconductor materials in which impurities are doped to the pure semiconductor to increase their conduction capabilities is known as an extrinsic semiconductor. Based on the group element is doped into the pure semiconductor, it is classified into two types p-type extrinsic semiconductor and n-type extrinsic semiconductor.

Difference between an intrinsic and extrinsic semiconductor

Intrinsic semiconductorExtrinsic semiconductor
These are pure semiconductorThese are impure semiconductor
No impurities are added to this.Impurities are added to this type of semiconductor to increase its conduction capabilities.
The number of free electrons and the number of holes in the conduction band are not equal.
N=P
The number of holes and the number of electrons are not equal.
N≠P
It has low electrical conductivity.It possesses way better conductivity than the intrinsic semiconductor.
Silicon (Si) and Germanium (Ge) are the most commonly used intrinsic semiconductor.Galium arsenide(GaS) is the most commonly used extrinsic semiconductor.
Its electrical conductivity depends upon the temperature only.The electrical conductivity of this type of semiconductor depends on the temp. as well as the concentration of doped impurity.

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