| Intrinsic semiconductor | Extrinsic semiconductor |
|---|---|
| The intrinsic semiconductor is extremely pure semiconductor. | The extrinsic semiconductor is impure semiconductor. |
| Electrical conductivity of intrinsic semiconductors is poor. | The electrical conductivity of extrinsic semiconductor is large. |
| The number of electron and holes produced due to the thermal energy are equal. | The number of electron and holes produced due to the thermal energy are not equal. |
| The current conduction is due to electrons and holes. | The current conduction is due to either holes or electrons. |
| The Fermi level is at the centre of forbidden energy gap and is unchanged with change in temperature. | The Fermi level is shifts upward or downward with change in temperature. |