Abstract
A modeling of the transport properties of p-type (Bi x Sb 1− x ) 2Te 3 single crystals is presented. Reasonably good agreement between calculated and experimental transport coefficients was achieved by considering a single valence band and acoustic phonon and ionized impurity scattering for holes. The anisotropy of the transport coefficients, in directions perpendicular (11) and parallel (33) to the trigonal c-axis of the crystals, was also taken into account in the model. The effective masses m ii , the isotropic and anisotropic energy independent relaxation time factors τ oac and τ oion ii for the main directions ( ii = 11 or 33) were determined for two solid solutions with x = 0.2 and 0.25. The lattice thermal conductivities were estimated for the two solid solutions. The maximum room temperature figure of merit was estimated at 3.2 × 10 −3K −1 for a solid solution with x = 0.225 in good agreement with the experimental results.
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