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arXiv 2307.01682cond-mat.mtrl-sci
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低成本Cu8SiSxSe6-x银辉石中高热电性能的发现

Discovery of the high thermoelectric performance in low-cost Cu8SiSxSe6-x argyrodites

Taras Parashchuk, Oleksandr Cherniushok, Raul Cardoso-Gil, Janusz Tobola, Yuri Grin, Krzysztof T. Wojciechowski

AI总结:

本文发现低成本Cu8SiSxSe6-x银辉石通过S替代Se稳定高对称立方相并降低晶格热导率,结合Cu偏离调控载流子浓度,使Cu7.95SiS3Se3的ZT达1.45、转换效率达13%,为无Te中温热电应用提供了新选择。

摘要:

铜基银辉石作为一类用于能量收集的新型热电材料已受到广泛关注。然而,这些材料中发生的相变以及较低的能量转换性能限制了它们在热电转换器中的广泛应用。本工作披露了一种新发现的高效Cu8SiSxSe6-x银辉石,该材料在282 K以上具有稳定的高对称立方相,从而开启了该材料在中温区应用的实际潜力。高对称相存在温度范围的拓宽得益于在Cu8SiSxSe6-x中成功用S替代Se,这提高了构型熵。所开发的银辉石由于态密度有效质量的增加和超低晶格热导率而表现出优异的热电性能。通过Cu偏离进一步调控载流子浓度显著改善了热电性能。Cu7.95SiS3Se3的无量纲热电优值ZT和估算能量转换效率η分别达到1.45和13%的优异数值,使该银辉石成为热电能量转换应用中一种低成本且无Te的替代材料。

英文摘要:

Cu-based argyrodites have gained much attention as a new class of thermoelectric materials for energy harvesting. However, the phase transition occurring in these materials and low energy conversion performance limited their broad application in thermoelectric converters. In this work, we disclose a newly discovered highly efficient Cu8SiSxSe6-x argyrodite with stabilized high-symmetry cubic phase at above 282 K opening the practical potential of this material for the mid-temperature region applications. The temperature range broadening of the high-symmetry phase existence was possible due to the successful substitution of Se with S in Cu8SiSxSe6-x, which enhances the configurational entropy. The developed argyrodites show excellent thermoelectric performance thanks to the increased density of states effective mass and ultralow lattice thermal conductivity. Further tuning of the carrier concentration through the Cu-deviation improves the thermoelectric performance significantly. The dimensionless thermoelectric figure of merit ZT and estimated energy conversion efficiency η for Cu7.95SiS3Se3 achieve outstanding values of the 1.45 and 13 %, respectively, offering this argyrodite as a low-cost and Te-free alternative for the thermoelectric energy conversion applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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