For extrinsic semiconductors, when doping level is increased;

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Fermi-level of p-type semiconductors will go upward for Fermi-level of n-type semiconductors will go downward.

Fermi-level of both p-type and n-type semiconductors will go upward for $T > T_{F} K$ and Downward $T < T_{F} K,$ where $T_{F}$ is Fermi temperature.

Fermi-level of p-type semiconductors will go downward and Fermi-level of n-type Semiconductor will go upward

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

answer is A.

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Detailed Solution

Pentavalent impurity is added to N-type semiconductors. A free electron is donated by each pentavalent impurity. As a result, the N-type semiconductor's Fermi level will rise.
On the other hand, trivalent impurity is added to P-type semiconductors. The valence band is pierced by each trivalent impurity. As a result, the P-type semiconductor's Fermi level will decrease.

Hence the correct answer is Fermi-level of p-type semiconductors will go downward and Fermi-level of n-type Semiconductor will go upward .

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