For extrinsic semiconductors; when doping level is increased; (a) Fermi-level of both p-type and n-type semiconductors will go upward for T > TFK and downward for T < TFK, where TF is Fermi temperature. (b) Fermi-level of p-type semiconductor will go upward and Fermi-level of n-type semiconductors will go downward (c) Fermi-level of p and n-type semiconductors will not be affected. (d) Fermi-level of p-type semiconductors will go downward and Fermi-level of n-type semiconductor will go upward.

Answer: (d). More donor doping in n-type adds electrons, so EF moves up towards the conduction band. More acceptor doping in p-type adds holes, so EF moves down towards the valence band. So the answer is (d).

For extrinsic semiconductors; when doping level is increased; | JEE Main 2021 (25 Feb, Shift 2)

Q38JEE Main 2021 · 25 FEB · SHIFT 2Medium

Intrinsic & Extrinsic Semiconductors

For extrinsic semiconductors; when doping level is increased;

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Answer: (d)

More donor doping in n-type adds electrons, so $E_F$ moves up towards the conduction band.
More acceptor doping in p-type adds holes, so $E_F$ moves down towards the valence band.
So the answer is (d).

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Intrinsic & Extrinsic Semiconductors question from JEE Main 2021 (25 Feb, Shift 2)

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