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valence band

   Also found in: Acronyms, Encyclopedia, Wikipedia 0.01 sec.
valence band
n
(Physics / General Physics) See energy band
valence band
The outermost electron shell of atoms in an insulator or semiconductor, in which the electrons are too tightly bound to the atom to carry electric current. Compare conduction band. See also bandgap.
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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.
Ultrafast dynamics and laser action of organic semiconductors by SciTech Book News
Figure 3 indicates an absorption edge at about 840 nm due to the optical transition from the valence band and conduction band.
Electrical conductivity and optical properties of poly(3-thiophene ... by Yakuphanoglu, Fahrettin; Senkal, B. Filiz / Polymer Engineering and Science
For high impurity concentration, when the impurity level merges with the conduction or valence band, the free electron (hole)-phonon scattering theory explains the conductivity values of a number of doped semiconductors.
Physics and Mathematics posters abstracts by Journal of the Alabama Academy of Science
 
 
 
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