What do mean band structure?explain.?

GATE Question

By Bharti Bikrama · Feb 19, 2020 ·GATE
Zayeda Sulthana answered Feb 19, 2020
In solid-state physics, the electronic band structure (or simply band structure) of a solid describes the range of energies of an electron that the solid may have within it (called energy bands, allowed bands, or simply bands) and also about the ranges of energy that it may not have (called band gaps or forbidden bands).

Band theory derives these bands and band gaps by examining the allowed quantum mechanical wave functions for an electron in a large, periodic lattice of atoms or molecules. Band theory has been successfully used to explain many physical properties of solids, such as electrical resistivity and optical absorption, and forms the foundation of the understanding of all solid-state devices (transistors, solar cells, etc.).

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