doping materials are called impurities because
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Doping materials are called impurities because they (a) decrease the number of charge carriers (b) change the chemical properties of semiconductors (c) make semiconductors less than 100 percent pure (d) alter the crystal structures of the pure semiconductors.
Doping materials are called impurities because they are added to a very pure intrinsic semiconductor material to improve its electrical properties. The doping material improves carrier concentration.
Group III atoms have one missing electron in their valence shell. When added to a semiconductor, after doping with group III atoms, it is called p-type material with high hole concentration.
Group V atoms have one extra electron in their valence shell. When added to a semiconductor, after doping with group V atoms, it is called n-type material with high electron concentration.
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