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The conductivity of a semiconductor incr...

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 nomber 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.

Text Solution

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The correct Answer is:
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.
As temperature is increased, large no. of charge carriers transit from valence band to conduction band. Thus, free charge carrier density is increased and so electrical conductivity of semiconductor increases considerably. This is the dominating factor for increase in electrical donductivity of semiconductors.
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Knowledge Check

  • When will the conductivity of a Ge semiconductor decrease?

    A
    On adding donor impurity
    B
    On adding acceptor impurity
    C
    On making UV light incident
    D
    On decreasing the temperature

  • When will the conductivity of a Ge semiconductor decrease?

    A
    on dopping donor impurity.
    B
    on adding acceptor impurity
    C
    on making UV light incident
    D
    on decreasing the temperature

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