MHT CET 2023 Physics question

Not in JEE Advanced syllabus

Doping of a semiconductor (with small impurity atoms) generally changes the resistivity as follows.

(A)DecreasesCorrect
(B)Does not change
(C)May increase or decrease depending on the dopant
(D)Increases

Answer: (A)

Solution

A pure (intrinsic) semiconductor has very few charge carriers at room temperature. Doping with a small amount of a pentavalent impurity (donor, n-type) adds free electrons, and doping with a trivalent impurity (acceptor, p-type) adds holes. In both cases the carrier concentration rises by many orders of

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Question ID VK-097850