Question

For extrinsic semiconductors; when doping level is increased;

(1) Fermi-level of p-type semiconductor will go upward and Fermi-level of n-type semiconductors will go downward.

(2) Fermi-level of p-type semiconductors will go downward and Fermi-level of n-type semiconductor will go upward.

(3) Fermi-level of both p-type and n-type semiconductros will go upward for T > T_F K and downward for T < T_F K, where T_F is Fermi temperature.

(4) Fermi-level of p and n-type semiconductors will not be affected.

Answer 1

Correct option is (2) Fermi-level of p-type semiconductors will go downward and Fermi-level of n-type semiconductor will go upward.

(2) conceptual