bandgap
Noun
Meaning
(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.
(physics) A gap in a frequency range in which waves cannot propagate.
The propagation of an acoustic wave inside a phononic crystal is forbidden in the bandgap frequency range due to Bragg scattering.
Synonyms
Examples
Barriers indicated for electrons to move from emitter to base, and for holes to be injected backward from base to emitter; also, grading of bandgap in base assists electron transport in base region; light colors indicate depleted regions.
Ch. 5 p. 116. ISBN 1-4200-7662-0 Because of their greater bandgap, silicon-based photodiodes generate less noise than germanium-based photodiodes.
Diamond has a wide bandgap of main corresponding to the deep ultraviolet wavelength of 225 nanometers.
Furthermore, because polysilicon has the same bandgap as the underlying silicon channel, it is quite straightforward to tune the work function to achieve low threshold voltages for both NMOS and PMOS devices.
Similarly, silicon p-i-n photodiodes citation have even higher quantum efficiencies, but can only detect wavelengths below the bandgap of silicon, i.e. ~1100 nm.
The tuning of the laser wavelength of 0.840 micrometres (main per photon) and the PV panel bandgap of main to each other produces an estimated conversion efficiency of 59% and a predicted power density of up to main.