Question

Distinguish between n type and p type semi conductors.

Answer 1

n-type	p-type
1. When pentavalent impurity atoms like As, Sb etc are added in the intrinsic semiconductor, we get n-type semiconductor.	1. When trivalent impurity atoms like gallium, indium etc are added in the intrinsic semiconductor, we get p-type semiconductor.
2. Majority carriers are electrons and minority are holes.	2. Majority carriers are holes and minority carriers are electrons.
3. Number density of electrons >> number density of holes.	3. Number density of holes >> number density of electrons.
4. Donor level lies closer to conduction band.	4. Accepts level lies closer to valence band.