Prove that the former level lies just in the middle of forbidden energy gap
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Fermi level exist due to kT i.e. thermal energy. the picture of th conduction and valance band with a precise band gap is only for vacuum. so in actual practice (at room temperature) some of the charge carriers will have sufficient energy to escape from the valance band according to fermi dirac distribution. due to this reason fermi level exists.!!
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Answer:
Fermi level exist due to kT i.e. thermal energy. the picture of th conduction and valance band with a precise band gap is only for vacuum. so in actual practice (at room temperature) some of the charge carriers will have sufficient energy to escape from the valance band according to fermi dirac distribution. due to this reason fermi level exists.!!
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