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EF = (Ec+ Ev)/2, this represents the Fermi energy level of which of the following?

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EF = (Ec+ Ev)/2, this represents the Fermi energy level of which of the following?

(a) Extrinsic semiconductor

(b) N-type semiconductor

(c) P-type semiconductor

(d) Intrinsic semiconductor

The question was posed to me in class test.

My doubt stems from Properties of Semiconductors in chapter Semiconductors of Engineering Physics II

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Right answer is (d) Intrinsic semiconductor

The explanation: The Fermi energy of an intrinsic semiconductor is EF = (Ec+ Ev)/2. That is the Fermi energy level exactly lies between the lowest energy level of conduction band and highest energy level of valence band.

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