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 ?
Since the valence band holes oxidize oxygen atoms constituting anatase [TiO.
Reference [1] gives the results predicted by an effective two-band model, one equivalent conduction band and one equivalent valence band at [GAMMA], that includes the densities of states modifications due to high concentrations of dopants and due to many-body effects associated with carrier-carrier interactions.
Electrons in the conduction band can move around in a semiconductor material, so can electrons in the valence band, but in a somewhat different way.
In a semiconductor, a luminescence photon is emitted when an electron at the bottom of the conduction band fills the hole at the top of the valence band.
The CuPt-type ordering leading to valence band splitting (VBS) and degradation of the optical properties of the heterojunction were analyzed.
This hyControl concept will be implemented using a novel experimental method, spin- and phase-resolved orbital mapping, that is capable of resolving the transient spin-dependent electronic structure of precisely those valence band electrons which mediate the hybridization in a single NHyU.
Figure 3 indicates an absorption edge at about 840 nm due to the optical transition from the valence band and conduction band.
2p] energy states in the valence band, as illustrated in Fig.
In photocatalysis, light energy from a UV-A light source ([Lambda] 350-400 nm) excites an electron from the valence band of the catalyst to the conduction band (Figure 1 shows a schematic representation of the photocatalytic process).
In a manner similar to the resonance study, Nilsson separated different valence band components of the nickel-copper interface.