Definitions
Wiktionary
- n. physics 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.
Examples
“The direct bandgap occurs when these maximum and minimum points are aligned along 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 indirect bandgap occurs when the maximum valence point and minimum conduction point are not aligned on the same wave vector.”
“Graphene doesn't naturally have a bandgap, which is necessary for most electronic applications," said IBM Fellow Phaedon Avouris, who oversees the company's carbon-based materials efforts.”
“The direct bandgap occurs when these maximum and minimum points are aligned along the same wave vector. [”
“The bandgap of GaAs corresponds to wavelengths longer than 1 micron.”
“If silicon is alloyed with other materials like germanium, amorphous silicon could reach a lower, and thus more optimal, bandgap.”
“To excite an electron across a direct bandgap, the valence electron and a photon, bundles of a large amount of energy with a small amount of momentum that come from the sun, must have an energy and momentum equal to or greater than that of the empty conduction band state.”
“For the electron to cross an indirect bandgap, the photon alone will not provide the electron with the correct energy and momentum to land itself in the conduction band state.”
“Another efficiency -- i.e., practicality -- issue with wide-bandgap superconductors is that fact that only high-energy photons work.”
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