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Question

In extrinsic P and N type semiconductor materials , the ratio of the impurity atom to the pure semiconductor atoms is about

A
1
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B
101
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C
104
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D
107
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Solution

The correct option is B 107
The ratio of the pure atoms to impure atoms in extrinsic semiconductors is 107. When pure or intrinsic semiconductors are doped with trivalent or pentavalent impurities then it results in the formation of n-type and p-type semiconductors.
This drastically affects the conduction of these semiconductors and provides free charge carriers to conduct electricity through the crystal.



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