Home Physics Semiconductor Electronics Semiconductors The conductivity of a semiconductor increase…
Physics Semiconductor Electronics Semiconductors MCQ (Single Correct)

The conductivity of a semiconductor increases with increase in temperature because

A
Number density of free current carriers increases
B
Relaxation time increases
C
Both number density of carriers and relaxation time increase.
D
Number density of current carriers increases relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density.

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The correct answer is:
D

As temperature increases the number density of charge carries increases according to the equation . Thus as temperature increases, the number density of charge carries increase resulting in conductivity of semiconductors.

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