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Strong lattice anharmonicity exhibited by the high-energy optical phonons in thermoelectric material

文献类型：期刊论文

作者Wu, Peng2,11; Fan, Feng-Ren3,4; Hagihala, Masato2,5; Kofu, Maiko5; Peng, Kunling10; Ishikawa, Yoshihisa6; Lee, Sanghyun2; Honda, Takashi2,5,9; Yonemura, Masao2,5; Ikeda, Kazutaka2,5,9
刊名NEW JOURNAL OF PHYSICS
出版日期2020-08-01
卷号22期号:8页码:9
关键词SnSe anharmonicity Raman spectroscopy pair distribution function inelastic neutron scattering
ISSN号1367-2630
DOI10.1088/1367-2630/aba98f
通讯作者Fan, Feng-Ren(ffan13@fudan.edu.cn) ; Sun, Zhe(zsun@ustc.edu.cn) ; Kamiyama, Takashi(takashi.kamiyama@kek.jp)
英文摘要Thermoelectric material SnSe has aroused world-wide interests in the past years, and its inherent strong lattice anharmonicity is regarded as a crucial factor for its outstanding thermoelectric performance. However, the understanding of lattice anharmonicity in SnSe system remains inadequate, especially regarding how phonon dynamics are affected by this behavior. In this work, we present a comprehensive study of lattice dynamics on Na(0.003)Sn(0.997)Se(0.9)S(0.1)by means of neutron total scattering, inelastic neutron scattering, Raman spectroscopy as well as frozen-phonon calculations. Lattice anharmonicity is evidenced by pair distribution function, inelastic neutron scattering and Raman measurements. By separating the effects of thermal expansion and multi-phonon scattering, we found that the latter is very significant in high-energy optical phonon modes. The strong temperature-dependence of these phonon modes indicate the anharmonicity in this system. Moreover, our data reveals that the linewidths of high-energy optical phonons become broadened with mild doping of sulfur. Our studies suggest that the thermoelectric performance of SnSe could be further enhanced by reducing the contributions of high-energy optical phonon modes to the lattice thermal conductivity via phonon engineering.
资助项目National Key R&D Program of China[2017YFA0402901] ; National Natural Science Foundation of China[51472036] ; National Natural Science Foundation of China[11674296] ; Key Research Program of the Chinese Academy of Sciences[XDPB01] ; Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology[2018CXFX002] ; CAS Interdisciplinary Innovation Team ; China Scholarship Council ; TIA-Kakehashi[TK17-52]
WOS研究方向Physics
语种英语
WOS记录号WOS:000565730800001
出版者IOP PUBLISHING LTD
源URL[http://119.78.100.138/handle/2HOD01W0/11708]  
专题中国科学院重庆绿色智能技术研究院
通讯作者Fan, Feng-Ren; Sun, Zhe; Kamiyama, Takashi
作者单位1.Ibaraki Univ, Grad Sch Sci & Engn, Tokai, Ibaraki 3191106, Japan
2.High Energy Accelerator Res Org KEK, Inst Mat Struct Sci, Tokai, Ibaraki 3191106, Japan
3.Fudan Univ, Lab Computat Phys Sci MOE, State Key Lab Surface Phys, Shanghai 200433, Peoples R China
4.Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China
5.J PARC Ctr, Mat & Life Sci Div, Tokai, Ibaraki 3191195, Japan
6.Comprehens Res Org Sci & Soc CROSS, Ctr Neutron Sci & Technol, Tokai, Ibaraki 3191106, Japan
7.Chinese Acad Sci, Key Lab Strongly Coupled Quantum Matter Phys, Univ Sci & Technol, Hefei 230026, Anhui, Peoples R China
8.CAS Ctr Excellence Superconducting Elect CENSE, Shanghai 200050, Peoples R China
9.SOKENDAI, Sch High Energy Accelerator Sci, Tokai, Ibaraki 3191106, Japan
10.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China
推荐引用方式
GB/T 7714		 Wu, Peng,Fan, Feng-Ren,Hagihala, Masato,et al. Strong lattice anharmonicity exhibited by the high-energy optical phonons in thermoelectric material[J]. NEW JOURNAL OF PHYSICS,2020,22(8):9.
APA Wu, Peng.,Fan, Feng-Ren.,Hagihala, Masato.,Kofu, Maiko.,Peng, Kunling.,...&Wu,Peng.(2020).Strong lattice anharmonicity exhibited by the high-energy optical phonons in thermoelectric material.NEW JOURNAL OF PHYSICS,22(8),9.
MLA Wu, Peng,et al."Strong lattice anharmonicity exhibited by the high-energy optical phonons in thermoelectric material".NEW JOURNAL OF PHYSICS 22.8(2020):9.

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来源：重庆绿色智能技术研究院

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