Improved Thermoelectrics Based on Bismuth and Antimony Chalcogenides for Temperatures below 240 K

Abstract:

Thermoelectric and galvanomagnetic properties for solid solution based on bismuth and antimony chalcogenides were studied for the optimal compositions and carrier concentrations in the temperature interval 100-240 K. Galvanomagnetic properties were analyzed in the framework of the many–valley energy spectrum model with isotropic and anisotropic scattering of charge carries. The figure-of-merit is shown to be determined with optimal relations between the values of the density-of-states effective mass, the carrier mobility taking into account degeneration of charge carriers, and the lattice thermal conductivity. The figure-of-merit also depends on anisotropy of the constant energy surface and scattering mechanism. Average values of the figure-of-merit through the temperature interval 100-240 K are equal to (2.5-2.65) 10-3 K1 for optimal compositions and carrier concentrations.

• Periodical: Advances in Science and Technology (Volume 74)
• Pages: 77-82
• DOI: https://doi.org/10.4028/www.scientific.net/AST.74.77
• Online since: October 2010
• Authors: Lidia N. Lukyanova, Vsevolod A. Kutasov, Piotr P. Konstantinov, Valeri V. Popov
• Keywords: Scattering Mechanism, Solid Solutions Based on Bismuth Telluride, Thermoelectricity, Transport Property

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