Hole and electron bands in n-type CdCr 2 Se 4

TLDR: In this article, a phenomenological model is presented to explain the anomalous temperature dependencies of the electrical resistivity and the Hall and Seebeck coefficients of indium-doped CdCr2Se4 with selenium deficiencies.

Abstract: A phenomenological model is presented to explain the anomalous temperature dependencies of the electrical resistivity and the Hall and Seebeck coefficients of indium-doped CdCr2Se4 with selenium deficiencies. The model postulates the existence of a hole band below localized donor levels, well above the intrinsic valence band. The assumed relative motions of the hole band and the donor level as the temperature is lowered, together with the optically deduced downward motion of the conduction band, are adequate to explain the data in a consistent manner. It is hypothesized that the hole band as well as the donor levels are related to the combination of indium ions and selenium deficiencies