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Achieving high average power factor in tetrahedrite Cu12Sb4S13 via regulating electron-phonon coupling strength

文献类型：期刊论文

作者Yan, Yanci2,3,4; Li, Nanhai3,4; Wang, Guiwen5; Xiong, Qihong3,4; Fan, Lizhu3,4; Jiang, Pengfei6; Lu, Xu3,4; Wang, Guoyu1; Zhou, Xiaoyuan3,4,5
刊名MATERIALS TODAY PHYSICS
出版日期2022
卷号22页码:9
关键词Anharmonicity Carrier mobility Electron-phonon coupling Tetrahedrties Thermoelectrics
ISSN号2542-5293
DOI10.1016/j.mtphys.2021.100590
通讯作者Lu, Xu(luxu@cqu.edu.cn) ; Wang, Guoyu(guoyuw@cigit.ac.cn) ; Zhou, Xiaoyuan(xiaoyuan2013@cqu.edu.cn)
英文摘要Lattice anharmonicity usually leads to low lattice thermal conductivity and thus is favored by thermoelectrics. However, if the anharmonicity is driven by strong lattice distortion, it is possible that the strong coupling between electrons and phonons would result in low carrier mobility. Yet, the fundamental physics of the competition between anharmonicity and mobility is not fully understood. In this study, taking thermoelectric tetrahedrite Cu12Sb4S13 as example, we try to elucidate such mechanism experimentally by analyzing electrical transport and local chemical bonding environment. It is found that substituting Sb with Sn can effectively suppress the local vibrational amplitude of Cu atoms, which is the origin of anharmonicity. As a result, electron-phonon coupling strength is regulated as well as the electrical conductivity and Seebeck coefficient are spontaneously promoted, leading to a substantially enhanced average power factor by more than 60%. Combined with the suppressed of electron-phonon coupling strength and exsolution process, a maximum zT of 1.1 at 723 K is achieved. These findings shed some light on the relationship between anharmonicity and carrier mobility, further emphasizing the importance of considering electron-phonon coupling for designing novel thermoelectric materials. (C) 2021 Elsevier Ltd. All rights reserved.
资助项目National Natural Science Foundation of China[51772035] ; National Natural Science Foundation of China[12004060] ; National Natural Science Foundation of China[52071041] ; National Natural Science Foundation of China[11874356] ; Fundamental Research Funds for the Central Universities[2019CDXYFXCS0006] ; Scientific and Technological Research Program of Chongqing Municipal Education Commission[KJQN202000635]
WOS研究方向Materials Science ; Physics
语种英语
WOS记录号WOS:000752565600006
出版者ELSEVIER
源URL[http://119.78.100.138/handle/2HOD01W0/15268]  
专题中国科学院重庆绿色智能技术研究院
通讯作者Lu, Xu; Wang, Guoyu; Zhou, Xiaoyuan
作者单位1.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China
2.Chongqing Univ Posts & Telecommun, Sch Sci, Chongqing 400065, Peoples R China
3.Chongqing Univ, Ctr Quantum Mat & Devices, Chongqing 401331, Peoples R China
4.Chongqing Univ, Coll Phys, Chongqing 401331, Peoples R China
5.Chongqing Univ, Analyt & Testing Ctr, Chongqing 401331, Peoples R China
6.Chongqing Univ, Coll Chem Engn, Chongqing 401331, Peoples R China
推荐引用方式
GB/T 7714		 Yan, Yanci,Li, Nanhai,Wang, Guiwen,et al. Achieving high average power factor in tetrahedrite Cu12Sb4S13 via regulating electron-phonon coupling strength[J]. MATERIALS TODAY PHYSICS,2022,22:9.
APA Yan, Yanci.,Li, Nanhai.,Wang, Guiwen.,Xiong, Qihong.,Fan, Lizhu.,...&Zhou, Xiaoyuan.(2022).Achieving high average power factor in tetrahedrite Cu12Sb4S13 via regulating electron-phonon coupling strength.MATERIALS TODAY PHYSICS,22,9.
MLA Yan, Yanci,et al."Achieving high average power factor in tetrahedrite Cu12Sb4S13 via regulating electron-phonon coupling strength".MATERIALS TODAY PHYSICS 22(2022):9.

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来源：重庆绿色智能技术研究院

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