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For an extrinsic semiconductor if doping concentration is increases then.

(1) For N-type and P-type fermi level will increase if T > Tf (T = temp of semi-conductor, Tf = fermi Temp.)

(2) For N-type fermi level will increase and for P-type fermi level will decrease.

(3) For N-type fermi level will decrease and for P-type fermi level will increase.

(4) For N-type fermi level will decrease and for P-type fermi level will decrease.

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Electronic devices, Semiconductors, Extrinsic and intrinsic Semiconductors

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Ans. (2) For N-type fermi level will increase and for P-type fermi level will decrease.

Sol. The variation of the fermi level obeys two conditions.

→ The mass action law

→ The neutrality equation.

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