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An intrinsic semiconductor us a semiconductor which is pure enough such that the impurities in it do not significantly affect its electrical behavior. The conductivity of intrinsic semiconductor increase with increase in temperature, at low temperature that valence band is completely full making the material an insulator.

As the temperate increase some of the electrons in the valence band acquire thermal energy that is greater than the forbidden band energy and move to the conduction band , these elections are now flow free to move under the influence of even a small applied field, these free electron also called conduction electrons constitute for electrical conduction and therefore the materials becomes a conductor.

Note that the electrical conductivity of an intrinsic semiconductor increase with increase in temperature, this is contrast with the behavior of metals (conductor) whose conductivity decrease with increase in temperature.

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