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

doi:10.1088/1367-2630/aba98f

	Strong lattice anharmonicity exhibited by the high-energy optical phonons in thermoelectric material
	Wu, Peng 10,11; Fan, Feng-Ren 8,9; Hagihala, Masato 7,10; Kofu, Maiko 7; Peng, Kunling 6; Ishikawa, Yoshihisa 1; Lee, Sanghyun 10; Honda, Takashi 2,7,10; Yonemura, Masao 7,10; Ikeda, Kazutaka 2,7,10
刊名	NEW JOURNAL OF PHYSICS
	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
DOI	10.1088/1367-2630/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
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000565730800001
内容类型	期刊论文
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.Comprehens Res Org Sci & Soc CROSS, Ctr Neutron Sci & Technol, Tokai, Ibaraki 3191106, Japan 2.SOKENDAI, Sch High Energy Accelerator Sci, Tokai, Ibaraki 3191106, Japan 3.Ibaraki Univ, Grad Sch Sci & Engn, Tokai, Ibaraki 3191106, Japan 4.Chinese Acad Sci, Key Lab Strongly Coupled Quantum Matter Phys, Univ Sci & Technol, Hefei 230026, Anhui, Peoples R China 5.CAS Ctr Excellence Superconducting Elect CENSE, Shanghai 200050, Peoples R China 6.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China 7.J PARC Ctr, Mat & Life Sci Div, Tokai, Ibaraki 3191195, Japan 8.Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China 9.Fudan Univ, Lab Computat Phys Sci MOE, State Key Lab Surface Phys, Shanghai 200433, Peoples R China 10.High Energy Accelerator Res Org KEK, Inst Mat Struct Sci, Tokai, Ibaraki 3191106, Japan
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.,...&Kamiyama, Takashi.(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.