释义 |
valence band in British English energy band in British Englishnoun physics a range of energies associated with the quantum states of electrons in a crystalline solid. In a semiconductor or an insulator there is a valence band containing many states, most of which are occupied. Above this is a forbidden band with only a few isolated states caused by impurities. Above this is a conduction band containing many states most of which are empty. In a metal there is a continuous valence-conduction band See also energy gap Examples of 'valence band' in a sentencevalence band As a result, the valence-band structure was determined.The ratio of conduction band offset and the valence-band offset was found to be 2.21.The valence band of argyrodite contains four energy separated groups of occupied subzones.Band tail states are localized electronic states existing near conduction and valence band edges.Substitutional doping induces holes around the valence-band maximum in a rigid-band fashion.This paper also addresses a model of the effective mass of valence band holes assuming the nonparabolic condition.In addition, we analyzed the valence band spectra of the samples and investigated the distribution characteristics of the valence electrons.Localization of the electronic states in the valence band and reduction of electron concentration in the conduction band was observed.The surface oxygen vacancies states result in the broadening of the valence band and the narrowing of the band gap.Investigated properties include total energy, cohesive energy, energy gap, valence band width, ionicity, and degeneracy of energy levels. |