Why does mobility decrease with increase in temperature?

The higher the temperature , i.e. the more kinetic energy the carriers have, the faster they will meet a scattering center. So in a simple model the higher the temperature the smaller the mobility. With increasing temperature, phonon concentration increases and causes increased scattering.
A.

Why does the conductivity of a semiconductor increase with increase in temperature?

The electrical conductivity of a semiconductor increases with increase in temperature because with increase in temperature the electrons overcome the energy barrier between the valence band and the conduction band easily.

Updated: 20th September 2018

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