Evidence for the domination of heavy holes and lattice scattering in SnTe from electrical transport measurements on polycrystalline thin films

TLDR: In this article, the influence of temperature and thickness on the electrical resistivity and Seebeck coefficient of polycrystalline SnTe thin films was investigated in detail and it was concluded that heavy holes are the dominant charge carriers.

Abstract: The influence of temperature and thickness on the electrical resistivity and Seebeck coefficient of polycrystalline SnTe thin films was investigated in detail. The size effect data for the electrical resistivity and Seebeck coefficient fit very well with Tellier's effective mean free path model. Different physical parameters such as Fermi energy (EF) and effective mass (m*) were evaluated. From this it is concluded that heavy holes are the dominant charge carriers. The Seebeck coefficient data were also fitted into the Jain-Verma expression to evaluate the scattering parameter (b) and the value of b clearly indicates the dominance of lattice scattering in SnTe.