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If Ef>Efi, then what is the type of the semiconductor?

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If Ef>Efi, then what is the type of the semiconductor?

(a) n-type

(b) P-type

(c) Elemental

(d) Compound

I had been asked this question in my homework.

This question is from Charge Densities in a Semiconductor impurities topic in chapter Conduction in Semiconductors of Electronic Devices & Circuits

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Correct option is (a) n-type

Easy explanation: For n-type, the Fermi energy level is greater than the intrinsic Fermi energy level because in an energy band, Fermi level of donors is always greater than that of the acceptors.

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