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In terms of energy bands, semiconductors can be defined as those materials that have:
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The correct answer is:
Almost an empty conduction band and almost filled valence band with a very narrow energy gap between the conduction and valence band.
CONCEPT:
Forbidden energy gap ( $\Delta \mathrm{Eg}$ ): Energy gap between the conduction band and valence band is known as the forbidden energy gap i.e.,
$\Delta E_g=(C . B)_{\min }-(V . B)_{\max }$
- No free electron is present in the forbidden energy gap.
- Width of the forbidden energy gap depends upon the nature of the substance.
- As temperature increases, the forbidden energy gap decreases very slightly.
Forbidden energy gap ( $\Delta \mathrm{Eg}$ ): Energy gap between the conduction band and valence band is known as the forbidden energy gap i.e.,
$\Delta E_g=(C . B)_{\min }-(V . B)_{\max }$
- No free electron is present in the forbidden energy gap.
- Width of the forbidden energy gap depends upon the nature of the substance.
- As temperature increases, the forbidden energy gap decreases very slightly.
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