MHT CET 2026 Physics question
Not in JEE Advanced syllabus
In n-type semiconductor (A) pentavalent impurity are dopants and holes are majority carriers. (B) trivalent impurity are dopants and electrons are minority carriers. (C) pentavalent impurity are dopants and electrons are majority carriers. (D) trivalent impurity are dopants and holes are majority carriers.
Answer: (B)
Solution
An n-type semiconductor is made by doping pure silicon or germanium with a pentavalent impurity (P, As, Sb). Four of its five valence electrons form covalent bonds, and the fifth electron is almost free and becomes a conduction electron. Hence electrons are the majority carriers and holes are the
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