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What type of material is obtained when an intrinsic semiconductor is doped with trivalent impurity?

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What type of material is obtained when an intrinsic semiconductor is doped with trivalent impurity?

(a) Extrinsic semiconductor

(b) Insulator

(c) N-type semiconductor

(d) P-type semiconductor

This question was posed to me in an interview for internship.

Question is from Properties of Semiconductors topic in chapter Semiconductors of Engineering Physics II

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Correct choice is (d) P-type semiconductor

For explanation I would say: P-type semiconductor is obtained by doping an intrinsic semiconductor with trivalent impurity.

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