MHT CET 2025 Physics question

Not in JEE Advanced syllabus

In n-type semiconductor, free electrons donated by the impurity atoms occupy energy levels in

(A)the conduction band
(B)the valence band
(C)the band gap and are close to the conduction bandCorrect
(D)the band gap and are close to the valence band

Answer: (C)

Solution

In an n-type semiconductor, pentavalent donor impurities (such as P, As) introduce extra electrons whose energy levels, called donor levels, lie in the forbidden band gap just below the bottom of the conduction band (only a small fraction of an eV below). At room temperature these electrons are easily

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Question ID VK-102050