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In semiconductors, thermal collisions ar...

In semiconductors, thermal collisions are responsible for taking a valence electorn to the conduction band.Why does the number of conduction electrons not go on increasing with time as thermal collisions continuously take place?

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New electrons are continuously transferred to the also lose energy to return to the valence band. At a particular temperature state of equilibrium is attined and number of electron in the conduction band remains constant.
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