Abstract In the last decade, high-performance Cu2Se thermoelectric materials and devices are attracting increasing research interest. In this review, we firstly summarize fundamentals of Cu2Se, including crystal structure, band structure, phase transition, and intrinsic thermoelectric performance. Then, we compare and overview the effectiveness of enhancing electrical transports and reducing lattice thermal conductivity on boosting figure of merit, zT of Cu2Se and found that zT enhancement of Cu2Se should be mainly attributed to reduced lattice thermal conductivity. After that, we highlight the chemical stability and mechanical properties of Cu2Se and its thermoelectric modules. In the end, we point out future research directions in the field of Cu2Se thermoelectrics. This review fills the gap of overview on the progress and challenge of Cu2Se thermoelectrics, and provide a new perspective to achieve Cu2Se-based thermoelectric materials with high thermoelectric performance.

中文翻译：

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Cu2Se 热电：性质、方法和器件

摘要 在过去的十年中，高性能 Cu2Se 热电材料和器件引起了越来越多的研究兴趣。在这篇综述中，我们首先总结了 Cu2Se 的基本原理，包括晶体结构、能带结构、相变和本征热电性能。然后，我们比较和概述了增强电传输和降低晶格热导率对提高 Cu2Se 的品质因数 zT 的有效性，发现 Cu2Se 的 zT 增强应主要归因于降低的晶格热导率。之后，我们重点介绍了 Cu2Se 及其热电模块的化学稳定性和机械性能。最后指出了Cu2Se热电领域未来的研究方向。