Definition of "bandgap" [bandgap]

• The energy difference between two allowed ranges of electron energy in a solid; especially the difference between the energies of the valence band and the conduction band. (noun)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "The indirect bandgap occurs when the maximum valence point and minimum conduction point are not aligned on the same wave vector."
• "The bandgap is the difference between the maximum energy point in the valence band and the minimum point in the conduction band."
• "The direct bandgap occurs when these maximum and minimum points are aligned along the same wave vector."