Effect of Silver and Iodine Co-doping on the Thermoelectric Properties of n-Type Bi2S3
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Bi2S3 is a promising thermoelectric material due to its low thermal conductivity. However, the low electrical conductivity has become an obstacle for its higher thermoelectric properties. To overcome this, on the basis of 1 mol.% BiI3 doping, Bi2S3 polycrystalline samples doped with various silver (Ag) concentrations were successfully prepared by melting combined with spark plasma sintering (SPS) to improve thermoelectric properties. The variation of lattice parameters were analyzed using x-ray diffraction, and electrical and thermal properties were investigated in the temperature range from 300 K to 723 K. The Ag and iodine (I) co-doping plays an important role in enhancing the electrical conductivity and maintaining a high Seebeck coefficient simultaneously. An ideal power factor of 3.95 μW cm−1 K−2 is obtained for the Ag0.0075Bi2S3 sample at 723 K. Meanwhile, the thermal conductivity is also reduced. As a result, a high thermoelectric figure-of-merit (ZT) of 0.62 is achieved, which is four times higher than that of pristine Bi2S3 at the same temperature.
KeywordsBi2S3 thermoelectric properties electrical conductivity co-doping
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This work was supported by the National Natural Science Foundation of China (51572111), the National Key Research and Development Program of China (2017YFB0310402), the Six Talent Peaks Project of Jiangsu Province (TD-XCL-004), the 333 talents project of Jiangsu province (BRA2017387), the Innovation/Entrepreneurship Program of Jiangsu Province (26), and the Qing Lan Project of Jiangsu Province (15).
- 9.J.P. Heremans, V. Jovovic, E.S. Toberer, A. Saramat, K. Kurosaki, A. Charoenphakdee, and G.J. Snyder, Science 554, 321 (2008).Google Scholar