MHT CET 2024 Physics question

Not in JEE Advanced syllabus

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

(A)the conduction band.
(B)the valance band.
(C)the band gap and are close to conduction band.Correct
(D)the band gap and are close to valance band.

Answer: (C)

Solution

In an n-type semiconductor, pentavalent impurity (donor) atoms are added. The extra (fifth) electron of each donor atom is very weakly bound and occupies a donor energy level that lies within the forbidden band gap, just below the bottom of the conduction band (about 0.01 eV to 0.05 eV below it). Small

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Question ID VK-098886