Energy band theory in solids - Electronics, Physics - eSaral

eSaral Academic and Editorial Team
Hey, do you want to learn about the Energy band theory in solids? If yes. Then you are at the right place.
Energy Bands in solid

Valence band:
The electrons in the outermost shells are not strongly bonded to their nuclei, these electrons are valence electrons. The band formed by these electrons is called the valence band.
Conduction band:
Valence electrons are loosely attached to the nucleus. Even at ordinary temperature, some of the valence electrons left the valence band. These are called free electrons and also called conduction electrons. The band occupied by these electrons is called the conduction band.
Forbidden energy gap ($\Delta$Eg.):
The separation between the conduction band and valence band is known as the forbidden energy gap.

$\Delta \mathrm{Eg} .=(\mathrm{CB})_{\mathrm{Min}}-(\mathrm{VB})_{\mathrm{Max}}$
- No free electrons are in F.E.G.
- The width of FEG depends upon the nature of the substance
- Width is more than valence electrons are strongly attached with the nucleus
- The width of FEG represent in eV
- If the conduction band is empty, then-current conduction is not possible.
- The Greater is the energy gap, the more tightly the valence electrons are bounded to the nucleus. The energy gap in some semiconductors is as follows-

The energy gap decreases slightly with an increase in temperature.
So, that's all from this article. I hope you get the idea about the Energy band theory in solids. If you found this article informative then please share it with your friends.
For a better understanding of this chapter, please check the detailed notes of Electronics Class 12. To watch Free Learning Videos on physics by Saransh Gupta sir Install the eSaral App.

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eSaral Academic and Editorial Team
Team eSaral is the collective author profile for educational content created by eSaral’s teachers and academic contributors. The team draws on expertise from IIT graduates, doctors, experienced educators and subject specialists to develop resources for JEE, NEET and school students. Our articles aim to explain concepts clearly and help students study with confidence.
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