Some electrical properties of semiconductors

1)Semiconductors have negative temperature coefficient of resistance i.e.. their resistivity decreases or conductivity increases rapidly with the temperature, especially at higher temperatures. Conductors, quite   contrary to the above, have positive temperature coefficient of resistance.

2)Their electrical conductivity is very much affected by even a very minute amount of impurity added to it.

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Semiconductor

There are large number of materials which have resistivities lying between those of an insulator and a conductor. Such materials are known as semiconductors. At absolute zero temperature, pure and perfect crystals of the semiconductor are nonconducting, their resistivity approaching to the resistivity of an insulator.

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