CBSE 2026 · Region 3 · Set 1 · Q21 · 2 marks
How are charge carriers created in an intrinsic semiconductor ? Explain.
Marking-scheme solution
At low temperatures, all the covalent bonds in an intrinsic semiconductor remain intact. As temperature increases, thermal energy becomes available and electrons may break away, becoming free electrons available for conduction.
The neighbourhood from which the free electron has come out leaves a vacancy with an effective positive charge. This vacancy is called a hole. Hence charge carriers are created.
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