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Enhanced thermoelectric performance in copper-deficient Cu2GeSe3

文献类型：期刊论文

作者Huang, Tianyu1,3; Yan, Yanci1,2; Peng, Kunling1,2; Tang, Xiaodan2; Guo, Lijie2; Wang, Ruifeng1,3; Lu, Xu2; Zhou, Xiaoyuan2; Wang, Guoyu1,3
刊名JOURNAL OF ALLOYS AND COMPOUNDS
出版日期2017-11-05
卷号723页码:708-713
关键词Cu2GeSe3 Thermoelectric properties Cu vacancies Defects CuGe
ISSN号0925-8388
DOI10.1016/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
WOS记录号WOS:000407009400089
出版者ELSEVIER SCIENCE SA
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.

入库方式： OAI收割

来源：重庆绿色智能技术研究院

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