Bi-Zn codoping in GeTe synergistically enhances band convergence and phonon scattering for high thermoelectric performance

doi:10.1039/d0ta08700a

CORC > 宁波材料技术与工程研究所 > 中国科学院宁波材料技术与工程研究所 > 2020专题

	Bi-Zn codoping in GeTe synergistically enhances band convergence and phonon scattering for high thermoelectric performance
	Guo, Zhe ; Zhang, Qiang ; Wang, Hongxiang ; Tan, Xiaojian ; Shi, Fanfan ; Xiong, Chenglong ; Man, Na ; Hu, Haoyang ; Liu, Guoqiang ; Jiang, Jun
刊名	JOURNAL OF MATERIALS CHEMISTRY A
	2020
卷号	8 期号:41 页码:21642-21648
关键词	LATTICE THERMAL-CONDUCTIVITY OPTIMIZATION EFFICIENCY FIGURE DOMAIN ALLOY MERIT POWER
DOI	10.1039/d0ta08700a
英文摘要	As an attractive lead-free thermoelectric candidate, GeTe-based materials have been intensively studied in recent years. However, the ZT value of pristine GeTe is limited around unit owing to the excessive hole concentration by intrinsic Ge vacancies. In this work, we report the synergistic enhancement of thermoelectric properties in rhombohedral GeTe by Bi-Zn codoping. It is found that Bi doping can effectively optimize the carrier concentration. Density functional calculations demonstrated that both Zn doping and the reduced c/a ratio by Bi doping could promote valence band convergence and Seebeck coefficient enhancement. Furthermore, lattice thermal conductivity is also significantly suppressed due to the Bi-Zn codoping introduced phonon scattering centers including point defects, Ge nano-precipitates, herringbone domains, twin boundaries, concentrated stress and density dislocations in the matrix. Consequently, a peak ZT of 2.0 at 700 K and a ZT(ave) of 1.35 from 400 to 800 K are realized in Ge0.9Bi0.06Zn0.04Te.
学科主题	Chemistry ; Energy & Fuels ; Materials Science
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/20364]
专题	2020专题
作者单位	1.Tan, XJ 2.Liu, GQ 3.Jiang, J (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China. 4.Jiang, J (corresponding author), Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
推荐引用方式 GB/T 7714	Guo, Zhe,Zhang, Qiang,Wang, Hongxiang,et al. Bi-Zn codoping in GeTe synergistically enhances band convergence and phonon scattering for high thermoelectric performance[J]. JOURNAL OF MATERIALS CHEMISTRY A,2020,8(41):21642-21648.
APA	Guo, Zhe.,Zhang, Qiang.,Wang, Hongxiang.,Tan, Xiaojian.,Shi, Fanfan.,...&Jiang, Jun.(2020).Bi-Zn codoping in GeTe synergistically enhances band convergence and phonon scattering for high thermoelectric performance.JOURNAL OF MATERIALS CHEMISTRY A,8(41),21642-21648.
MLA	Guo, Zhe,et al."Bi-Zn codoping in GeTe synergistically enhances band convergence and phonon scattering for high thermoelectric performance".JOURNAL OF MATERIALS CHEMISTRY A 8.41(2020):21642-21648.