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In which of the following semiconductor, the concentration of the holes and electrons is equal?

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In which of the following semiconductor, the concentration of the holes and electrons is equal?

(a) Intrinsic

(b) Extrinsic

(c) Compound

(d) Elemental

I got this question during a job interview.

The question is from Electrons and Holes in Semiconductor topic in portion Conduction in Semiconductors of Electronic Devices & Circuits

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The correct answer is (a) Intrinsic

Easiest explanation: In the intrinsic semiconductor, ni=pi that is the number of the electrons is equal to the number of the holes. Whereas in the extrinsic conductor ni is not equal to pi.

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