Semi conductor have impurities its resistivity …
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Sia ? 6 years, 4 months ago
Intrinsic semiconductor(without impurity): A pure semiconductor has low concentration of charge carriers. These charge carriers are thermally generated(when the temperature is increased the electrons gain enough energy to become free from the influence of the nucleus). So the conductivity of the material is very less.
Extrinsic case(with impurity): There are two types of charge carriers in semiconductors. They are electrons and holes. If a trivalent impurity is added then the no of holes increases and if a pentavalent impurity is added then the no of electrons will increase. Since conductivity depends on the no of charge carriers per unit volume, the conductivity increases.
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