Why does the resistance decreases with increase in temperatures in semiconductors?

Hi Satendra, A semiconductor is a mixture of a conductor and an insulator.In a semiconductor, the conduction band and the valence are moderately separated whereas they are largely separated or energy gap is as large as possible in insulators and less or negligible energy gap in conductors. 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. All the best.

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