Intrinsic Semiconductors
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Extrinsic Semiconductors
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| Intrinsic semiconductors are the conductors which have pure form of semiconductors. Therefore they do not have any quantity of impurity. |
Extrinsic semiconductors are the conductors which are made by adding some quantity of impurity to pure semiconductors. |
| They show poor electrical conductivity. |
They show high electrical conductivity. |
| They have the same number of electrons in conduction band and holes in valance band. |
They have the different number of electrons and holes. It depends on the type of that particular extrinsic semiconductor. |
| The electrical conductivity of intrinsic semiconductors totally depends on temperature |
The electrical conductivity of extrinsic semiconductors depends on both temperature and amount of impurity doped in semiconductor |
| The Fermi energy levels lie in the middle of the valence and conduction band. |
The Fermi energy level shifts towards the valence or conduction band. |
| In intrinsic semiconductors, the pure forms of silicon and germanium crystals are used |
In extrinsic semiconductors, impurities like arsenic, antimony, phosphorous, aluminium indium, etc are added. |
