Nature of thermoelectric anisotropy in semiconductors at the lower temperatures

It is found that, on the basis of anisotropic scattering theory for monovalley semiconductors and experimental data on electrical conductivity and Seebeck coefficients measured at lower temperatures on pure single crystals of ZnSb, it is possible to evaluate relaxation times and effective masses of charge carriers. Analytical expressions are obtained for TE anisotropy and components of the Seebeck coefficient tensor for such semiconductors at lower temperatures, in which phonon drag effects predominate. The method are illustrated on an example of p-type ZnSb single crystals of various purity