A semiconductor is doped with a donor impurity :

the hole concentration increases

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the hole concentration decreases

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the electron concentration increases

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the electron concentration decreases

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Solution

The correct options are
C the hole concentration decreases
D the electron concentration increases
Donor impurity means that the doping element has extra electron which it can donate.
Hence, donor impurity will increase the concentration of electron and at the same time it will decrease the hole concentration by favouring recombination of hole electron pair.

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Similar questions

Q. A semiconductor is doped with a donor impurity.
(a) The hole concentration increases.
(b) The hole concentration decreases.
(c) The electron concentration increases.
(d) The electron concentration decreases.

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