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Question

An intrinsic semiconductor has 1018/m3 free electron and is doped with pentavalent impurity of 1024/m3. Then the free electrons density order increase by

A
4
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B
3
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C
5
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D
6
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Solution

The correct option is C 6
Given that, free electron density in intrinsic semiconductor is 1018/m3. When it is doped with a pentavalent impurity of density 1024/m3, then the free electrons are donated and thus density order of free electrons increase by (2418=6).

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