Electrophysical properties and electronic structure of tin-doped antimony telluride

The effect of Sn atoms on the electrophysical properties and x-ray photoelectron spectra of Czochralski-grown Sb₂Te₃ single crystals is studied. The character of the temperature dependences of the kinetic coefficients is shown to depend noticeably on the structure of the valence band, which consists of two valence subbands. Estimates of the effective density-of-states masses of holes and of the gap between the valence-band extrema in Sb₂Te₃: Sn agree with the data available for the Sb₂Te₃ not doped with tin. X-ray photoelectron spectra of Sb₂Te₃: Sn single crystals do not exhibit noticeable core-level shifts and electron density redistribution in the valence band.