Investigation on structure and thermoelectric properties in p-type Bi0.48Sb1.52Te3 via PbTe incorporating
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Bismuth telluride alloys are the most commercially used thermoelectric materials. Herein, Bi0.48Sb1.52Te3 + x wt% PbTe (x = 0, 0.05, 0.1, and 0.15) composites have been prepared by the zone-melting method. The microstructure and thermoelectric properties of the composites are investigated. It is found that PbTe addition could effectively improve the electrical properties of Bi0.48Sb1.52Te3. As a result, a very large power factor of 55.5 µW cm−1 K−2 is achieved at 300 K for x = 0.05. Compared with the matrix, the largest figure of merit ZT for the composites shows slight enhancement, and the average figure of merit ZT ave is obviously improved. This work indicated that a trace amount of PbTe can effectively improve the thermoelectric performance of Bi0.48Sb1.52Te3.
This work was supported by the National Natural Science Foundation of China (11404350, 11404348, 51702334, and 11234012), the Zhejiang Provincial Science Foundation for Distinguished Young Scholars (LR16E020001), Natural Science Foundation of Zhejiang Province (LY18A040008 and LY18E020017), and the Ningbo Science and Technology Innovation Team (2014B82004).
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