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CGP EDU Academic Team
Published on: August 14, 2026
For extrinsic semiconductors: when doping level is increased;
A
Fermi-level of 
and 
-type semiconductors will not be affected.
and -type semiconductors will not be affected.
B
Fermi-level of p-type semiconductors will go downward and Fermi-level of n-type semiconductor will go upward.
C
Fermi-level of both 
-type and n-type semiconductors will go upward for 
and downward for 
, where 
is Fermi temperature.
-type and n-type semiconductors will go upward for and downward for , where is Fermi temperature.
D
Fermi-level of p-type semiconductor will go upward and Fermi-level of n-type semiconductors will go downward.
Text Solution
Verified by ExpertsThe correct answer is:
B
In n-type semiconductor pentavalent impurity is added. Each pentavalent impurity donates a free electron. So the Fermi-level of n-type semiconductor will go upward.
& In p-type semiconductor trivalent impurity is added. Each trivalent impurity creates a hole in the valence band. So the Fermi-level of p-type semiconductor will go downward.
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