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Enhanced thermoelectric performance of Cu2SnSe3 via synergistic effects of Cd-do** and CuGaTe2 alloying

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Abstract

In this work, we show significantly enhanced thermoelectric performance in Cu2SnSe3 via a synergistic effect of Cd-do** and CuGaTe2 alloying in the temperature range of 300–823 K. Both the electron and phonon transport properties can be simultaneously regulated by Cd do** at Sn site, leading to a higher quality factor. Meanwhile, a maximum figure of merit (zT) value of ~ 0.68 was obtained for Cu2Sn0.93Cd0.07Se3 sample at 823 K, which is about four times higher than that of the pristine sample (zT = 0.18 at 773 K). Furthermore, Cu2Sn0.93Cd0.07Se3 was alloyed with CuGaTe2 to reduce the lattice thermal conductivity in the high-temperature region. Consequently, a further enhanced zT value (0.77, 823 K) was achieved in the (Cu2Sn0.93Cd0.07Se3)0.94(CuGaTe2)0.06 sample, with a high average zT (zTave) value of 0.30 between 300 and 823 K. These results demonstrate that Cd-do** combined with CuGaTe2 alloying could be an effective method to enhance zT values of Cu2SnSe3 based compounds.

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摘要

本文通过在Cu2SnSe3中掺杂Cd和固溶CuGaTe2, 实现了热电性能提升的协同效应, 最终使Cu2SnSe3材料体系热电性能在300-823 K得到显著增**. 在Sn位点掺杂Cd可以协同调控电子和声子输运特性, 从而提高品质因子. 同时, 在823 K下, Cu2Sn0.93Cd0.07Se3样品的峰值热电优值 (zT) 达到0.68, 是母体的最大热电优值 (773 K, zT = 0.18) 的4倍左右. 进一步在Cu2Sn0.93Cd0.07Se3样品中固溶CuGaTe2能降低该体系材料高温区的晶格热导率. 最终, (Cu2Sn0.93Cd0.07Se3)0.94(CuGaTe2)0.06样品的热电优值 (zT) 较母体获得了大幅提升 (0.77, 823 K), 最大**均热电优值 (zTave) 在300-823 K之间为0.30. 这些结果表明, Cd掺杂与CuGaTe2固溶的结合为Cu2SnSe3基化合物热电优值的优化提供了有效策略.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 11874356, 52071041, 12004060, 51972102 and 51877023), the Key Research Program of Frontier Sciences, CAS (No. QYZDB-SSW-SLH016). We would like to thank the Analytical and Testing Center of Chongqing University for assistance with the sample characterization.

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Authors and Affiliations

  1. Faculty of Physics and Electronic Sciences, Hubei Key Laboratory of Ferro and Piezoelectric Materials and Devices, Hubei University, Wuhan, 430062, China

    Yi-**g Fan, Hao-Shuang Gu & Yong-Ming Hu

  2. College of Physics, Chongqing University, Chongqing, 400044, China

    Yi-**g Fan, Kun-Ling Peng, Yu-Ling Huang, Jian Li, Yan-Ci Yan, Xu Lu & **ao-Yuan Zhou

  3. State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing, 400044, China

    Hui-Jun Liao, Zheng-Yong Huang, Jian Li, Xu Lu & **ao-Yuan Zhou

  4. School of Science, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China

    Yan-Ci Yan

  5. Analytical and Testing Center, Chongqing University, Chongqing, 400044, China

    Bin Zhang & **ao-Yuan Zhou

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  1. Yi-**g Fan
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Fan, YJ., Peng, KL., Huang, YL. et al. Enhanced thermoelectric performance of Cu2SnSe3 via synergistic effects of Cd-do** and CuGaTe2 alloying. Rare Met. 41, 3466–3474 (2022). https://doi.org/10.1007/s12598-022-02043-9

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