KMS Chongqing Institute of Green and Intelligent Technology, CAS
| Synergistically promoted thermoelectric performance of SnTe by alloying with NaBiTe2 | |
Zhang, Mengke1,2; Tang, Xiaodan1,2; Li, Nanhai1,2; Wang, Guiwen3; Wang, Guoyu2 ; Liu, Anping1; Lu, Xu1 ; Zhou, Xiaoyuan1
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| 2020-04-27 | |
| 摘要 | SnTe, as a lead-free analog of PbTe, shows limited thermoelectric performance because of the high hole concentration arising from intrinsic Sn vacancies and its high thermal conductivity. Herein, we show a significantly improved thermoelectric performance in p-type SnTe through NaBiTe2 alloying, by which carrier concentration optimization, band structure engineering, and thermal conductivity reduction are simultaneously realized. Band modification is confirmed by transport coefficient analysis based on the single parabolic band model. The low lattice thermal conductivity of SnTe-NaBiTe2 solid solutions is ascribed to point defect scattering. As a result, a zT value of similar to 1.1 at 834K is achieved in the sample with the nominal composition of (SnTe)(0.96)(NaBiTe2)(0.04). |
| DOI | 10.1063/1.5144697 |
| 发表期刊 | APPLIED PHYSICS LETTERS
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| ISSN | 0003-6951 |
| 卷号 | 116期号:17页码:5 |
| 通讯作者 | Lu, Xu(luxu@cqu.edu.cn) ; Zhou, Xiaoyuan(Xiaoyuan2013@cqu.edu.cn) |
| 收录类别 | SCI |
| WOS记录号 | WOS:000530431500002 |
| 语种 | 英语 |
