MCQ
When an impurity is doped into semiconductor, the conductivity of the semiconductor:
- ✓Increases
- BDcreases
- CRemains same
- DBecomes zero
✓
Answer
Correct option: A.
Increases
The pure semiconductor has less number of thermally generated charge carriers. But when it is doped with pentavalent or trivalent impurity atoms, the number of charge carriers i.e. electrons and holes increases. So conductivity increases.
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