Enhanced thermoelectric performance in copper-deficient Cu2GeSe3

doi:10.1016/j.jallcom.2017.06.133

CORC > 重庆绿色智能技术研究院 > 中国科学院重庆绿色智能技术研究院 > 机器人与3D打印技术创新中心

	Enhanced thermoelectric performance in copper-deficient Cu2GeSe3
	Huang, Tianyu 1,3; Yan, Yanci 1,2; Peng, Kunling 1,2; Tang, Xiaodan 2; Guo, Lijie 2; Wang, Ruifeng 1,3; Lu, Xu 2; Zhou, Xiaoyuan 2; Wang, Guoyu1,3
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2017-11-05
卷号	723 页码:708-713
关键词	Cu2GeSe3 Thermoelectric properties Cu vacancies Defects CuGe
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2017.06.133
通讯作者	Wang, GY (reprint author), Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China.
英文摘要	Cu2GeSe3 was synthesized via a procedure without annealing step, which leads to suppressed lattice thermal conductivity via formation of more defects. However, an unexpected drop in Seebeck coefficient was also observed compared with samples with similar hole concentration, which may be related to some kind of compensation effect in Seebeck coefficient. To suppress this effect and optimize the thermoelectric performance, a series of copper- deficient samples Cu2- xGeSe3(x = 0, 0.05, 0.1, 0.2) are prepared and studied. Contrary to common knowledge, it is found that the copper deficiency decreases the hole concentration rather than increase it. An upturn in electrical conductivity curve and a bending in Seebeck coefficient curve are found in the copper- deficient samples, which may be related to bipolar effect, or to the thermal ionization of acceptors such as VCu. Finally the power factor is optimized and the peak value of zT = 0.65 is obtained at 758 K for Cu1.95GeSe(3). (C) 2017 Elsevier B. V. All rights reserved.
资助项目	Key Research Program of Frontier Sciences, CAS[QYZDB-SSW-SLH016] ; Project for Fundamental and Frontier Research in Chongqing[CSTC2015JCYJBX0026] ; National Natural Science Foundation of China[11674040] ; National Natural Science Foundation of China[11404044] ; National Natural Science Foundation of China[51472036]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000407009400089
内容类型	期刊论文
源URL	[http://172.16.51.4:88/handle/2HOD01W0/121]
专题	机器人与3D打印技术创新中心
通讯作者	Wang, Guoyu
作者单位	1.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China 2.Chongqing Univ, Coll Phys, Chongqing 401331, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Huang, Tianyu,Yan, Yanci,Peng, Kunling,et al. Enhanced thermoelectric performance in copper-deficient Cu2GeSe3[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2017,723:708-713.
APA	Huang, Tianyu.,Yan, Yanci.,Peng, Kunling.,Tang, Xiaodan.,Guo, Lijie.,...&Wang, Guoyu.(2017).Enhanced thermoelectric performance in copper-deficient Cu2GeSe3.JOURNAL OF ALLOYS AND COMPOUNDS,723,708-713.
MLA	Huang, Tianyu,et al."Enhanced thermoelectric performance in copper-deficient Cu2GeSe3".JOURNAL OF ALLOYS AND COMPOUNDS 723(2017):708-713.