Question

Distinguish between intrinsic and extrinsic semiconductors.

Answer 1

Intrinsic	Extrinsic
These are pure semiconducting tetravalent crystals.	These are semiconducting tetravalent crystals doped with impurity atom group III or v
Their electrical conductivity is low.	Their electrical conductivity is high.
There is no permitted energy state between valance and conduction band.	There is no permitted energy state of the impurity atom between valance and conduction band
Their electrical conductivity depends on  temperature.	Their electrical conductivity depends on temperature as well as dopant concentration.