electric field is applied and semiconductors can conduct electricity
only when the temperature is greater than 0 k.
INTRINSIC SEMICONDUCTOR:Intrinsic semiconductors are the charge
carriers that means electrons in the conduction band and holes in the
valence band.And the semiconductors in their pure form are called as
intrinsic semiconductors.With increase in the thermal energy covalent
bonds are broken and electron-hole pairs are created in the
semiconductors. Ex:silicon and germanium.
EXTRINSIC SEMICONDUCTORS:Extrinsic semiconductor are formed by
adding tritalent or pentatalent impurities to a pure semiconductor or
to intrinsic semiconductors by adding this conductivity increases.And
the process of adding impurities to semiconductors is called 'DOPING'.
Extrinsic semiconductors are of two types:
1.N-type semiconductors 2.P-type
semiconductors 03:45
