Where electrons *aren’t*. It may seem dumb that we treat the lack of something as a particle, but it’s really important in modeling bandgaps and other important stuff with semiconductors.
The absence of a valence electron in a covalent bond structure. The hole exhibits a positive charge.
Grob’s Basic Electronics, 11th Edition by Mitchel E. Schultz
The absence of an electron in the valence band of an atom.
Electronic Devices : Conventional Current Version, 9th Edition by Thomas L. Floyd