Tell us about charge carriers: a) in semiconductors without impurities;

Tell us about charge carriers:
a) in semiconductors without impurities;
b) in semiconductors with a donor impurity;
c) in semiconductors with an acceptor impurity.

a) in semiconductors without impurities, charge carriers are electrons and holes;
b) in semiconductors with a donor impurity, electrons predominate as charge carriers;
c) in semiconductors with an acceptor impurity, holes predominate as charge carriers.

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