Investigation of the electronic structure and lattice dynamics of the thermoelectric material Na-doped SnSe
文献类型：期刊论文
| 作者 | Wu, P.1,2 ; Zhang, B.1; Peng, K. L.3; Hagihala, M.2; Ishikawa, Y.2; Kofu, M.4; Lee, S. H.2; Kumigashira, H.5; Hu, C. S.1; Qi, Z. M.1
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| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2018-09-20 |
| 卷号 | 98期号:9页码:7 |
| ISSN号 | 2469-9950 |
| DOI | 10.1103/PhysRevB.98.094305 |
| 英文摘要 | SnSe has drawn considerable attention on a global scale due to its intrinsic low thermal conductivity and large figure of merit along the b axis. In Na-doped SnSe, further enhancement of the thermoelectric performance has been reported. Using angle-resolved photoemission spectroscopy and inelastic neutron scattering, we have studied how electronic structures and lattice dynamics evolve with temperature in Na-doped SnSe. Our data show that the effective mass of the Se p(z) orbital along the Gamma - Z direction has a very weak temperature dependence, while the chemical potential shifts significantly along with the increase in the gap size evidenced by infrared absorption measurements. Inelastic neutron scattering reveals one acoustic TA and two low-lying optical (TO1 and TO2) phonon modes. Their temperature-dependent behaviors indicate that the TO1 and TA modes contribute more to the reduction of the lattice thermal conductivity with temperature increases. The estimated value of the lattice thermal conductivity based on the lattice dynamics is significantly larger than that determined by transport measurements, suggesting that extrinsic factors, such as the imperfection of the lattice, could drastically suppress the lattice thermal conductivity. Our data suggest that temperature-dependent properties of both electronic structures and phonon dynamics need to be taken into account for the investigation of the underlying physics of hole-doped SnSe. |
| 资助项目 | China Scholarship Council ; National Natural Science Foundation of China[51472036] ; National Natural Science Foundation of China[U1532136] ; National Key R&D Program of China[2017YFA0402901] ; Key Research Program of Frontier Sciences, CAS[QYZDB-SSW-SLH016] ; TIA-Kakehashi[TK17-52] ; J-PARC[2017A0198] ; J-PARC[2017A0218] ; KEK-PF[2017PF-01] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| 出版者 | AMER PHYSICAL SOC |
| WOS记录号 | WOS:000445172800004 |
| 源URL | [http://119.78.100.138/handle/2HOD01W0/6727]  |
| 专题 | 中国科学院重庆绿色智能技术研究院 |
| 通讯作者 | Wang, G. Y. |
| 作者单位 | 1.Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Anhui, Peoples R China 2.KEK, Inst Mat Struct Sci, Tokai, Ibaraki 3191106, Japan 3.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China 4.Japan Atom Energy Agcy, Japan Proton Accelerator Res Complex, Tokai, Ibaraki 3191195, Japan 5.KEK, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan 6.Univ Sci & Technol China, CAS Key Lab Strongly Coupled Quantum Matter Phys, Hefei 230026, Anhui, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, P.,Zhang, B.,Peng, K. L.,et al. Investigation of the electronic structure and lattice dynamics of the thermoelectric material Na-doped SnSe[J]. PHYSICAL REVIEW B,2018,98(9):7. |
| APA | Wu, P..,Zhang, B..,Peng, K. L..,Hagihala, M..,Ishikawa, Y..,...&Kamiyama, T..(2018).Investigation of the electronic structure and lattice dynamics of the thermoelectric material Na-doped SnSe.PHYSICAL REVIEW B,98(9),7. |
| MLA | Wu, P.,et al."Investigation of the electronic structure and lattice dynamics of the thermoelectric material Na-doped SnSe".PHYSICAL REVIEW B 98.9(2018):7. |
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来源：重庆绿色智能技术研究院
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