CBSE Class 12 Physics 2022 Term 2 Outside Delhi Set 1 Solved Paper

Question : 1

Total: 12

1. What is meant by doping of an intrinsic semiconductor? Name the two types of atoms used for doping of Ge∕Si. 2

Solution:

Doping of an Intrinsic Semiconductor: The mixing of a small amount of pentavalent (e.g. phosphorus) or trivalent (e.g., aluminium) substance as impurity in a pure semiconductor (e.g., Ge,Si ) is called doping. Doping increases the conductivity of a semiconductor.
For doping pure Si,Ge, pentavalent phosphorus is used to convert it to n-type semiconductor. Trivalent aluminium is used to convert pure Si,Ge to p-type semiconductor.

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