中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 重庆绿色智能技术研究院
  3. 中国科学院重庆绿色智能技术研究院
Anomalous Thermoelectric Performance in Asymmetric Dirac Semimetal BaAgBi

文献类型：期刊论文

作者Zhou, Zizhen3; Peng, Kunling1,4; Xiao, Shijuan3; Wei, Yiqing3; Dai, Qinjin3; Lu, Xu3; Wang, Guoyu2; Zhou, Xiaoyuan3
刊名JOURNAL OF PHYSICAL CHEMISTRY LETTERS
出版日期2022-03-17
卷号13期号:10页码:2291-2298
ISSN号1948-7185
DOI10.1021/acs.jpclett.2c00379
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Multiple-band degeneracy has been widely recognized to be beneficial for high thermoelectric performance. Here, we discover that the p-type Dirac bands with lower degeneracy synergistically produce a higher Seebeck coefficient and electrical conductivity in topological semimetal BaAgBi. The anomalous transport phenomenon intrinsically originated from the asymmetric electronic structures: (i) complete p-type Dirac bands near the Fermi level facilitate high and strong energy-dependent hole relaxation time; (ii) the presence of additional parabolic conduction valleys allows for a large density of states to accept scattered electrons, leading to an enlarged hole-electron relaxation time ratio and, thus, weakened bipolar effect. In combination with the strong lattice anharmonicity, an exceptional p-type average ZT of 0.42 is achieved from 300 to 600 K, which can be dramatically enhanced to 1.38 via breaking the C-3v symmetry. This work uncovers the underlying mechanisms governing the abnormal transport behavior in Dirac semimetal BaAgBi and highlights the asymmetric electronic structures as target features to discover/design high-performance thermoelectric materials.
资助项目National Natural Science Foundation of China[52125103] ; National Natural Science Foundation of China[52071041] ; National Natural Science Foundation of China[11874356] ; National Natural Science Foundation of China[12104071]
WOS研究方向Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
语种英语
WOS记录号WOS:000776518000004
出版者AMER CHEMICAL SOC
源URL[http://119.78.100.138/handle/2HOD01W0/15491]  
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.Univ Sci & Technol China, Dept Phys, Hefei 230026, Anhui, Peoples R China
2.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Sichuan, Peoples R China
3.Chongqing Univ, Coll Phys, Ctr Quantum Mat & Devices, Chongqing 401331, Sichuan, Peoples R China
4.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
推荐引用方式
GB/T 7714		 Zhou, Zizhen,Peng, Kunling,Xiao, Shijuan,et al. Anomalous Thermoelectric Performance in Asymmetric Dirac Semimetal BaAgBi[J]. JOURNAL OF PHYSICAL CHEMISTRY LETTERS,2022,13(10):2291-2298.
APA Zhou, Zizhen.,Peng, Kunling.,Xiao, Shijuan.,Wei, Yiqing.,Dai, Qinjin.,...&Zhou, Xiaoyuan.(2022).Anomalous Thermoelectric Performance in Asymmetric Dirac Semimetal BaAgBi.JOURNAL OF PHYSICAL CHEMISTRY LETTERS,13(10),2291-2298.
MLA Zhou, Zizhen,et al."Anomalous Thermoelectric Performance in Asymmetric Dirac Semimetal BaAgBi".JOURNAL OF PHYSICAL CHEMISTRY LETTERS 13.10(2022):2291-2298.

入库方式： OAI收割

来源：重庆绿色智能技术研究院

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。