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Classify metals, semiconductors and insu...

Classify metals, semiconductors and insulators on the basis of energy bands.

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Formation of Energy Bands : In case of isolated atoms, the energy levels will be discrete. When atoms are very close to each other as in solids, nucleus of each atom interacts with the electrons of the neighbouring atoms. This splits each energy level into number of closely placed energy levels which appear as bands. The energy band corresponding to the valence electrons from valence band (VB) and the energy band above valence band forms conduction band (CB). The gap between the top of VB and bottom of CB is the energy band gap(`E_g`).
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Knowledge Check

  • The forbidden energy gap in conductors , semiconductors and insulators are EG_1 , EG_2 and EG_3 respectively . The relation among them is :

    A
    `EG_1 =EG_2=EG_3`
    B
    `EG_1 gt EG_2gt EG_3`
    C
    `EG_1 lt EG_2 lt EG_3`
    D
    `EG_1 lt EG_2 gt EG_3`

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