Thermoelectric properties of copper-deficient Cu2-xSe (0.05 ≤ x ≤ 0.25) binary compounds

doi:10.1016/j.ceramint.2017.05.161

SIC OpenIR

	Thermoelectric properties of copper-deficient Cu2-xSe (0.05 ≤ x ≤ 0.25) binary compounds
	Yu, Jinlong 1,2; Zhao, Kunpeng 1,2; Qiu, Pengfei 1; Shi, Xun 1; Chen, Lidong 1
	2017
Source Publication	Ceramics International
ISSN	02728842
Volume	43 Issue:14 Pages:11142-11148
Abstract	Recently, many novel superionic thermoelectric materials have been discovered along the concept of “phonon-liquid electron-crystal” (PLEC). Among them, Cu2-xSe-based liquid-like materials are typical examples. In this study, a series of copper-deficient Cu2-xSe (0.05 ≤ x ≤ 0.25) materials were synthesized and used to study the role of Cu vacancies on the electrical and thermal transport properties. The X-ray photoelectron spectroscopy (XPS) measurements suggest that the valence states of Cu and Se are independent on the Cu/Se atomic ratio. With increasing the content of Cu vacancies, the hole concentration is monotonously increased, leading to the improved electrical conductivity and reduced Seebeck coefficient. Based on the single parabolic band model analysis, it is found that changing the content of Cu vacancies does not obviously modify the material's electronic band structure and effective mass. Due to the presence of highly mobile Cu ions inside the crystal structure, the lattice thermal conductivities of all Cu2-xSe (0.05 ≤ x ≤ 0.25) materials are very low with values around 0.39 W m−1 K−1at 500 K. Because of the significantly reduced Seebeck coefficient and increased electronic thermal conductivity, the thermoelectric figure of merit zTs are decreased when increasing x from 0.05 to 0.25. At 750 K, a maximum zT of 0.46 is obtained in Cu1.95Se among all Cu2-xSe (0.05 ≤ x ≤ 0.25) materials. © 2017 Elsevier Ltd and Techna Group S.r.l.
DOI	10.1016/j.ceramint.2017.05.161
EI Accession Number	20172203706493
EI Keywords	Copper compounds
EI Classification Number	544.1 Copper - 615.4 Thermoelectric Energy - 641.1 Thermodynamics - 701.1 Electricity: Basic Concepts and Phenomena - 933.1.1 Crystal Lattice
Citation statistics
Document Type	期刊论文
Identifier	http://ir.sic.ac.cn/handle/331005/25868
Collection	中国科学院上海硅酸盐研究所
Affiliation	1.State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai; 200050, China; 2.University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing; 100049, China
Recommended Citation GB/T 7714	Yu, Jinlong,Zhao, Kunpeng,Qiu, Pengfei,et al. Thermoelectric properties of copper-deficient Cu2-xSe (0.05 ≤ x ≤ 0.25) binary compounds[J]. Ceramics International,2017,43(14):11142-11148.
APA	Yu, Jinlong,Zhao, Kunpeng,Qiu, Pengfei,Shi, Xun,&Chen, Lidong.(2017).Thermoelectric properties of copper-deficient Cu2-xSe (0.05 ≤ x ≤ 0.25) binary compounds.Ceramics International,43(14),11142-11148.
MLA	Yu, Jinlong,et al."Thermoelectric properties of copper-deficient Cu2-xSe (0.05 ≤ x ≤ 0.25) binary compounds".Ceramics International 43.14(2017):11142-11148.

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