Question

For an extrinsic semiconductor if doping concentration is increases then.

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

Comments

Electronic devices, Semiconductors, Extrinsic and intrinsic Semiconductors

Answer 1

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.