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When a semiconductor is doped with donor impurity

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both hole concentration and electron concentration decrease

the hole concentration increases and electron concentration decreases

the hole concentration decreases and electron concentration increases

both hole concentration and electron concentration increase

answer is A.

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Detailed Solution

A semiconductor is when doped with a donor impurity will increase the concentration of electron and at the same time donor impurities will decrease the hole concentration by favouring recombination of the hole electron pair.

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