Explain the difference between conductor, insulator and semicondu… - Vidyadip

Question

Explain the difference between conductor, insulator and semiconductor on the basis of energy band in solids.

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Answer

On the basis of energy band, the difference between conductor, insulator and semi-conductor is divided as follows :
(i) Conductors: Those substances for which the forbidden energy gap $\Delta E$ is almost zero, are called conductors. In these the valence band and conduction band overlap each other.
(ii) Insulators: Those substances for which the value of forbidden energy gap $\Delta E g$ situated between the valence band and conduction band is 6 eV or more, are called insulators or insulators.
(iii) Semiconductor : Those substances for which the value of forbidden energy gap between valence band and conduction band is around 1 eV , they are called semiconductor materials.

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