Thermal Properties for Hot-Pressed n-type (Bi1-xSbx)2Te3 Alloys

概要

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We have measured the thermal properties of an n-type hot-pressed Bi1.8Sb0.2Te3 alloy with a carrier concentration of $3.1\times 10^{19}$ cm-3. With the adjustable parameters determined from these experimental data, the dependence of thermal properties on the carrier concentrations is investigated, using the two-band-conduction model with a mixed scattering mechanism and a small fluctuation theory. The maximum dimensionless figures of merit of the alloy in a carrier concentration range of $0.8--3\times 10^{19}$ cm-3 have values over 0.7 at temperatures between 250 K and 300 K and a minimum thermal conductivity of 1 W/Km. These alloys are comparable to single crystals, showing the possibility that they provide higher thermoelectric performance than the single crystals, since their microstructure can be controlled by hot-press processing.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-03-15