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Enhanced thermoelectric properties of ploycrystalline BiCuSeO via dual-doping in Bi sites

Abstract

The effect of Pb and La substitution on the thermoelectric property of BiCuSeO oxyselenide has been studied. It is revealed that Pb doping can significantly improve the electrical conductivity due to the increased carrier concentration, which results in a large power factor in range of 700 to 800 μWm-1K-2 at 873 K. Especially, the electrical transport property can be further improved obviously over the entire measured temperature after replacing some Bi3+ with La3+ in Bi0.94Pb0.06CuSeO. The electrical conductivity has increased from 408 S/cm for Bi0.94Pb0.06CuSeO to 594 S/cm for Bi0.93Pb0.06La0.01CuSeO at 327 K due to the increased carrier mobility. Combining the less reduced Seebeck coefficient which is over 124 µV/K, the power factor has been significantly improved. An optimal value of 1059 µWm-1K-2 around room temperature is achieved for Bi0.93Pb0.06La0.01CuSeO, which is much higher than most reported values. Additionally, the increased total thermal conductivity for the Pb doped sample compared with the pristine one has been suppressed after further doping La element in Bi0.94Pb0.06CuSeO. Therefore, a maximum ZT value nearly 0.90 at 873 K for the sample Bi0.92La0.02Pb0.06CuSeO has been finally obtained, which is ~36% and ~16% higher as compared with those of La-free sample Bi0.94Pb0.06CuSeO and the reported Pb-free sample Bi0.92La0.08CuSeO.

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Publication details

The article was received on 25 Dec 2018, accepted on 10 Feb 2019 and first published on 11 Feb 2019


Article type: Research Article
DOI: 10.1039/C8QI01402G
Citation: Inorg. Chem. Front., 2019, Accepted Manuscript

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    Enhanced thermoelectric properties of ploycrystalline BiCuSeO via dual-doping in Bi sites

    F. Li, M. Ruan, Y. Chen, W. Wang, J. Luo, Z. Zheng and P. Fan, Inorg. Chem. Front., 2019, Accepted Manuscript , DOI: 10.1039/C8QI01402G

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