Explain the effect of temperature on the resistivity of pure semiconductors.

Explanation

The change in resistivity of a pure semiconductor is mainly due to the change in charge carrier concentration. The fraction of number of electrons raised from valence band to conduction band is given by
`f prop e^(-E_(g)//KT)`
`rArr` As the temperature (T) increases, the value of the fraction f also increases.
`rArr` Conductivity of semiconductor increases.
`rArr` With the rise of temperature, resistivity of semiconductor decreases.