Semiconducting Devices Question 138
Question: Let $ n _{P} $ and $ n _{e} $ be the number of holes and conduction electrons respectively in a semiconductor. Then
[MP PET 1995]
Options:
A) $ n _{P}>n _{e} $ in an intrinsic semiconductor
B) $ n _{P}=n _{e} $ in an extrinsic semiconductor
C) $ n _{P}=n _{e} $ in an intrinsic semiconductor
D) $ n _{e}>n _{P} $ in an intrinsic semiconductor
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Answer:
Correct Answer: C
Solution:
In intrinsic semiconductors, the creation or liberation of one free electron by the thermal energy has created one hole.
Thus in intrinsic semiconductors ne = nh
