Question

Why band gap and resistivity of a semiconductor decreases as the temperature increases?

Answer 1

Ans ➡️ Because When the temperature in increased the forbidden gap between the two bands becomes very less and the electrons move from the valence band to the conduction band. ... Thus when the temperature is increased in a semiconductor, the density of the charge carriers also increases and the resistivity decreases.

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Answer 2

In case of semiconductors as the temperature increases the electrons in the valence band get excited and jump into the conduction band and hence the conductance increases resulting in the dwindling of resistance. As resistance is directly proportional to resistivity, resistivity decreases, too.