22. Electrical conductivity of a semiconductor (i) increases with temperature (ii) increases on doping with a suitable material. Give reasons.
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Explanation:
The electrical conductivity of solids is due to the motion of electrons and holes or ions.
Conduction of ionic solids is due to the absence of vacancies and other defects. Thus, the conductivity of semiconductors, as well as insulators, is mainly because of impurities and defects present in them. Electrons and holes produced by the ionization of defects contribute to conduction in these solids.
The electrical conductivity of semiconductors increases with increasing temperature because, with increase in temperature, number of electrons from the valence bond can jump to the conduction band in semiconductors.
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