Journal
JOURNAL OF MATERIOMICS
Volume 4, Issue 3, Pages 208-214Publisher
ELSEVIER
DOI: 10.1016/j.jmat.2018.05.008
Keywords
Bismuth telluride; Thermoelectric materials; Hot deformation; Alloying
Funding
- National Natural Science Foundation of China [11574267, 51571177, 61534001]
- National Natural Science Fund for Distinguished Young Scholars [51725102]
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Bismuth telluride-based alloys are the most widely used commercial thermoelectric (TE) material for room temperature refrigeration. Here, we successfully shift up the optimum figure of merit of n-type bismuth-telluride-based TE materials for mid-temperature power generation. SbI3 doping is used to regulate the carrier concentration and Indium alloying to increase the bandgap, suppressing the detrimental bipolar conduction in the mid-temperature range. The lattice thermal conductivity is significantly reduced due to the multiscale microstructures induced via hot deformation. As a result, a peak zT of similar to 1.1 was attained at 625 K for Bi1.85In0.15Te2Se +( 0.25) wt% SbI3 alloy after hot deformation, showing a great application prospect of this alloy in mid-temperature TE power generation. (C) 2018 The Chinese Ceramic Society. Production and hosting by Elsevier B.V.
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