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Question
Distinguish between intrinsic and extrinsic semiconductors.
Solution
| Sr. No. | Intrinsic Semiconductor | Extrinsic Semiconductor |
| 1. | These are pure semiconducting tetravalent crystals. | These are semiconducting tetravalent crystals doped with impurity atoms group III (or) V. |
| 2. | Their electrical conductivity is low. | Their electrical conductivity is high. |
| 3. | There is no permitted energy state between valence and conduction band. | There is no permitted energy state of the impurity atom between valence and conduction band. |
| 4. | Their electrical conductivity depends on temperature. | Their electrical conductivity depends on temperature as well as dopant concentration. |
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