Conduction of Electricity in Semiconductors
In semiconductors, the gap between the valence band and conduction band is small.
This enables some electrons to jump to conduction band and exhibit their conductivity.
Electrical conductivity of semiconductors increases with increase in temperature, since more electrons can jump to the conduction band due to small gap between the valence band and conduction band.
Silicon and germanium exhibit this behavior and are called intrinsic semiconductors.
The conductivity of these intrinsic semiconductors is too low to be practically used.
