Discussion
Suitable impurities are added to a semiconductor depending on its use. This is done in order to
Answer: C
Impurities are added to increase the semiconductor's electrical conductivity.
Doping with a pentavalent element such as phosphorus adds free electrons, giving n-type material; a trivalent one such as boron adds holes, giving p-type. Either raises the carrier concentration by orders of magnitude, and putting the two together makes the p-n junction.
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