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What is meant by the term ‘forbidden zone' in reference to band theory of solids?

What is meant by the term ‘forbidden zone' in reference to band theory of solids?

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3 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
9 years ago
‘forbidden zone' in reference to band theory of solids:-According to bond theory, forbidden zone is the energy gap between valence band and conduction band in solids.This gap is large in insulators and small in semi-conductors.There is no forbidden zone in metals, because in metals valence and conduction band overlap
Forbidden zone is the energy gap. It is the gap between the valence band and conduction band in the band theory.

Prerna
19 Points
6 years ago
Simply , it is the energy gap between co condution and valance band .... Large in insulators ,Small in semi-conductors ,Absent in conductors ...
Harish Dhingra
11 Points
6 years ago
It is the gap which an electron has to cover in order to conduct electricity.This energy difference between valance band and conduction bands maximum in insulators,intermideate in semiconductors.In case of metals both bands overlap each other.That’s why metals are the best conductors of electricity.

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