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At T=0 K, the location of Fermi level with respect to the Ec and Ed for the n type material is?

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At T=0 K, the location of Fermi level with respect to the Ec and Ed for the n type material is?

(a) Above than conduction band

(b) Midway

(c) Lower than Ed

(d) Greater than Ed

This question was posed to me in a job interview.

This question is from Donor and Acceptor impurities topic in portion Conduction in Semiconductors of Electronic Devices & Circuits

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Correct choice is (b) Midway

The best explanation: At T=0 K, the Fermi level of n band lies between the midway of Ec and Ed as intrinsic Fermi level always lies between the Ec and Ev.

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