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What is energy gap in Band theory? Compa...

What is energy gap in Band theory? Compare its size in conductors, semiconductors and insulators.
Or
Define the 'Forbidden zone' of an insulator.

Text Solution

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Energy gap. or .Forbidden zone. is defined as the gap between the valence band and conduction band. In conductors the energy gap is nearly equal to zero. In semiconductors it is nearly equal to I e V, while in insulators it is about 5 e V.
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Knowledge Check

  • The main difference between conductors, semiconductors and insulators is because of

    A
    work function
    B
    biding energy of electrons
    C
    width of forbidden energy gap
    D
    mobility of electrons

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