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Effective mass (solid-state physics)
About: Effective mass (solid-state physics) is a research topic. Over the lifetime, 12539 publications have been published within this topic receiving 295485 citations.
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TL;DR: Hall effect measurements on doped, n-type single-crystals of ZnO have yielded: a density-of-states mass of 0.5 m, a shallow donor ionization energy, and the temperature dependence of mobility as discussed by the authors.
90 citations
TL;DR: In this paper, a self-consistent calculation of the nuclear level density based on a generalization to finite temperature of a modified Thomas-Fermi method is presented, which avoids the difficulty of adding external constraints to calculate isolated nuclei at finite temperature.
90 citations
TL;DR: In this article, a guiding principle based on electronegativity is proposed to shed new light on n-type doping in Zintl antimonides, which is used to compare the effects of different chalcogen dopants on thermoelectric properties.
Abstract: n-type Mg3Sb1.5Bi0.5 has recently been discovered to be a promising thermoelectric material, yet the effective n-type dopants are mainly limited to the chalcogens. This may be attributed to the limited chemical insight into the effects from different n-type dopants. By comparing the effects of different chalcogen dopants Q (Q = S, Se, and Te) on thermoelectric properties, it is found that the chalcogen dopants Q become more efficient with decreasing electronegativity difference between Q and Mg, which is mainly due to the increasing carrier concentration and mobility. Using density functional theory calculations, it is shown that the improving carrier concentration originates from the increasing doping limit induced by the stabilizing extrinsic defect. Moreover, the increasing electron mobility with decreasing electronegativity difference between Q and Mg is attributed to the smaller effective mass resulting from the enhancing chemical bond covalency, which is supported by the decreasing theoretical density of states. According to the above trends, a simple guiding principle based on electronegativity is proposed to shed new light on n-type doping in Zintl antimonides. (Less)
90 citations
TL;DR: In this article, it was shown that the semiconductor charge carrier energy-wave vector relationship rather than that of the metal is dominant because it controls the cone of acceptance for carriers incident on the barrier from the metal side.
Abstract: An appreciable difference is shown to be expected to exist between the experimentally measured Richardson constant and the ‘ideal’ Richardson constant associated with the flux of a Maxwellian distribution of carriers in a semiconductor. The equality which must exist between the Richardson constant for the forward and reverse characteristics is discussed. The semiconductor charge carrier energy—wave vector relationship rather than that of the metal is shown to be dominant because it controls the cone of acceptance for carriers incident on the barrier from the metal side. The effective mass in the ideal Richardson constant for T-F emission is shown to be the same as that for thermionic emission. This mass, which is associated with the E - k relationship transverse to the direction of current flow, can be considerably different from the tunneling effective mass which is the effective mass component in the direction of the current flow.
89 citations
TL;DR: The analysis provides a new estimate of the band gap of zinc Blende CdSe as well as the band offsets in zinc blende and wurtzite C dSe, CdS, and ZnSe, and it is analyzed within an effective mass model.
Abstract: The interband and intraband spectra of colloidal II-VI CdS and CdSe quantum dot cores and CdS∕ZnSe, CdS∕CdSe, CdSe∕CdS, and CdSe∕ZnSe core/shell systems are reported. Infrared absorption peaks between 0.5 and 0.2eV are observed. The slope of the intraband energy versus the first interband absorption feature is characteristic of the relative band alignments of the materials constituting the core and the shell and it is analyzed within an effective mass model. The analysis provides a new estimate of the band gap of zinc blende CdSe as well as the band offsets in zinc blende and wurtzite CdSe, CdS, and ZnSe.
89 citations