what is the importance of energy gap in a semiconductor?
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Energy band gap differentiates the metals into conductor, insulator, semiconductor. Energy band gap is usually referred to the energy difference between the conduction band and the valence band. The conduction band is the outermost energy band where the free electrons lie and below that there is the valence band.
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Importance of energy gap in a semiconductor:
- It is the energy which required for the promotion of a valence electron that bound to an atom which become a "conduction electron", that is free for moving within the "crystal lattice" and it also serves as the "charge carrier" to the conduct of electric current.
- There aren't any free electrons which present in semiconductor materials that can be easily conduct the electricity just like any another metal.
Despite of free electrons, that there are two types of bands in the semiconductors:
- Valence band.
- Conduction band.
There is a gap that is in between the two types of bands which mentioned above that is referred to as the energy gap.
To know more:
Direct bandgap semiconductors are better suited for solar cell applications than indirect bandgap semiconductors.
True
False
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