Knowledge Management System of Hefei Institute of Physical Science,CAS
Achieving Ultralow Lattice Thermal Conductivity and High Thermoelectric Performance in GeTe Alloys via Introducing Cu2Te Nanocrystals and Resonant Level Doping | |
Zhang, Qingtang1; Ti, Zhuoyang2; Zhu, Yuelei3; Zhang, Yongsheng2; Cao, Yang1; Li, Shuang1; Wang, Meiyu3; Li, Di2; Zou, Bo1; Hou, Yunxiang1; Wang, Peng3; Tang, Guodong1 | |
2021-12-28 | |
发表期刊 | ACS NANO |
ISSN | 1936-0851 |
通讯作者 | Wang, Peng(wangpeng@nju.edu.cn) ; Tang, Guodong(tangguodong@njust.edu.cn) |
摘要 | The binary compound of GeTe emerging as a potential medium-temperature thermoelectric material has drawn a great deal of attention. Here, we achieve ultralow lattice thermal conductivity and high thermoelectric performance in In and a heavy content of Cu codoped GeTe thermoelectrics. In dopants improve the density of state near the surface of Femi of GeTe by introducing resonant levels, producing a sharp increase of the Seebeck coefficient. In and Cu codoping not only optimizes carrier concentration but also substantially increases carrier mobility to a high value of 87 cm(2) V-1 s(-1 )due to the diminution of Ge vacancies. The enhanced Seebeck coefficient coupled with dramatically enhanced carrier mobility results in significant enhancement of PF in Ge1.04-x-yInxCuyTe series. Moreover, we introduce Cu2Te nanocrystals' secondary phase into GeTe by alloying a heavy content of Cu. Cu2Te nanocrystals and a high density of dislocations cause strong phonon scattering, significantly diminishing lattice thermal conductivity. The lattice thermal conductivity reduced as low as 0.31 W m(-1) K-1 at 823 K, which is not only lower than the amorphous limit of GeTe but also competitive with those of thermoelectric materials with strong lattice anharmonicity or complex crystal structures. Consequently, a high ZT of 2.0 was achieved for Ge0.9In0.015Cu0.125Te by decoupling electron and phonon transport of GeTe. This work highlights the importance of phonon engineering in advancing high-performance GeTe thermoelectrics. |
关键词 | resonant levels nanocrystals thermoelectric materials carrier concentration lattice thermal conductivity |
DOI | 10.1021/acsnano.1c05650 |
关键词[WOS] | BAND CONVERGENCE ; POLYCRYSTALLINE SNSE ; FIGURE ; MERIT ; PBTE ; EFFICIENCY ; LEADS ; SNTE |
收录类别 | SCI |
语种 | 英语 |
资助项目 | National Natural Science Foundation of China[52071182] ; Qinglan Project of the Young and Middle-aged Academic Leader of Jiangsu Province ; Fundamental Research Funds for the Central Universities[30921011107] |
项目资助者 | National Natural Science Foundation of China ; Qinglan Project of the Young and Middle-aged Academic Leader of Jiangsu Province ; Fundamental Research Funds for the Central Universities |
WOS研究方向 | Chemistry ; Science & Technology - Other Topics ; Materials Science |
WOS类目 | Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary |
WOS记录号 | WOS:000751890100052 |
出版者 | AMER CHEMICAL SOC |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.hfcas.ac.cn:8080/handle/334002/127555 |
专题 | 中国科学院合肥物质科学研究院 |
通讯作者 | Wang, Peng; Tang, Guodong |
作者单位 | 1.Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, MIIT Key Lab Adv Metall & Intermetall Mat Technol, Nanjing 210094, Peoples R China 2.Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China 3.Nanjing Univ, Innovat Ctr Adv Microstruct, Coll Engn & Appl Sci & Collaborat, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China |
推荐引用方式 GB/T 7714 | Zhang, Qingtang,Ti, Zhuoyang,Zhu, Yuelei,et al. Achieving Ultralow Lattice Thermal Conductivity and High Thermoelectric Performance in GeTe Alloys via Introducing Cu2Te Nanocrystals and Resonant Level Doping[J]. ACS NANO,2021,15. |
APA | Zhang, Qingtang.,Ti, Zhuoyang.,Zhu, Yuelei.,Zhang, Yongsheng.,Cao, Yang.,...&Tang, Guodong.(2021).Achieving Ultralow Lattice Thermal Conductivity and High Thermoelectric Performance in GeTe Alloys via Introducing Cu2Te Nanocrystals and Resonant Level Doping.ACS NANO,15. |
MLA | Zhang, Qingtang,et al."Achieving Ultralow Lattice Thermal Conductivity and High Thermoelectric Performance in GeTe Alloys via Introducing Cu2Te Nanocrystals and Resonant Level Doping".ACS NANO 15(2021). |
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