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How are charge carriers produced in intrinsic semiconductors?

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How are charge carriers produced in intrinsic semiconductors?

(a) By pure atoms

(b) By electrons

(c) By impure atoms

(d) By holes

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This intriguing question comes from Properties of Semiconductors topic in section Semiconductors of Engineering Physics II

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Right option is (c) By impure atoms

Easiest explanation: Impure semiconductors in which the charge carriers are produced due to impurity atoms are called extrinsic semiconductors. They are obtained by doping an intrinsic semiconductor with impurity atoms.

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