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Physics · 2024 · 2 marks
Semiconductor Electronics: Materials, Devices and Simple CircuitsIntrinsic Semiconductor2 marksUnderstandvery short answer
CBSE 2024 · Region 2 · Set 1 · Q21
How does the energy gap of an intrinsic semiconductor effectively change when doped with a (a) trivalent impurity, and (b) pentavalent impurity?…
How does the energy gap of an intrinsic semiconductor effectively change when doped with a (a) trivalent impurity, and (b) pentavalent impurity? Justify your answer in each case.
Marking-scheme solution
(a)
Decreases.
Justification: An acceptor energy level is formed just above the top of the valence band.
(b)
Decreases.
Justification: A donor level is formed just below the bottom of the conduction band.
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CBSE Class 12 Physics past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.