valence band


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Related to valence band: Fermi level

Valence band

The highest electronic energy band in a semiconductor or insulator which can be filled with electrons. The electrons in the valence band correspond to the valence electrons of the constituent atoms. In a semiconductor or insulator, at sufficiently low temperatures, the valence band is completely filled and the conduction band is empty of electrons. Some of the high energy levels in the valence band may become vacant as a result of thermal excitation of electrons to higher energy bands or as a result of the presence of impurities. The net effect of the valence band is then equivalent to that of a few particles which are equal in number and similar in motion to the missing electrons but each of which carries a positive electronic charge. These “particles” are referred to as holes. See Band theory of solids, Conduction band, Electric insulator, Hole states in solids, Semiconductor

valence band

[′vā·ləns ‚band]
(solid-state physics)
The highest electronic energy band in a semiconductor or insulator which can be filled with electrons.
References in periodicals archive ?
In this paper, we use the four-band model that has three conduction sub-bands centered at the [GAMMA], L, and X symmetry points in the Brillouin zone and one equivalent valence band centered at the [GAMMA] symmetry point.
In the amorphous semiconductor materials, the optical transition is from the valence-band tail states to the conduction band and from the extended states in the valence band to the conduction-band tail states (14).
During the x-ray emission process, the transition valence electron excites a plasmon in the valence band.
In the sodium bismuthate they studied, the bulk conduction and valence bands touch only at discrete points and disperse linearly along all three momentum directions to form bulk 3D Dirac fermions.
In the sodium bismuthate we studied, the bulk conduction and valence bands touch only at discrete points and disperse linearly along all three momentum directions to form bulk 3D Dirac fermions.
Editor Vardeny (physics, University of Arizona) has included perspectives from both sides of the debate on whether the excited state in organic semiconductors is band-like, with electrons and holes in conduction and valence bands similar to regular semiconductors, or whether the photogenerated geminate electron-holes are bound together to form tightly bound excitons with large binding energy.
For instance, copper's bandgap is near zero because the conduction and valence bands touch each other.