Question

How does electrical conductivity
of a semiconductor change with
temperature? Why?​

Answer 1

Answer:

Electrical conductivity of the semiconductors increases with increase in the temperature. The conductivity of the semiconductors is due to the presence of the impurities and defects. As number of defects increases with the temperature, conductivity increases.

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Answer 2

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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.