Extremely low thermal conductivity and high thermoelectric performance in liquid-like Cu2Se1-: XSxpolymorphic materials

doi:10.1039/c7ta05788a

	Extremely low thermal conductivity and high thermoelectric performance in liquid-like Cu2Se1-: XSxpolymorphic materials
	Zhao, Kunpeng 1,2; Blichfeld, Anders Bank 3,4; Eikeland, Espen 3,5; Qiu, Pengfei 1; Ren, Dudi 1; Iversen, Bo Brummerstedt 3; Shi, Xun 1; Chen, Lidong 1
刊名	Journal of Materials Chemistry A
	2017
卷号	5 期号:34 页码:18148-18156
ISSN号	20507488
DOI	10.1039/c7ta05788a
英文摘要	Recently, copper chalcogenides Cu2-xδ (δ = S, Se, Te) have attracted great attention due to their exceptional thermal and electrical transport properties. Besides these binary Cu2-xδ compounds, the ternary Cu2-xδ solid solutions are also expected to possess excellent thermoelectric performance. In this study, we have synthesized a series of Cu2Se1-xSx(x = 0.2, 0.3, 0.5, and 0.7) solid solutions by melting the raw elements followed by spark plasma sintering. The energy dispersive spectroscopy mapping, powder and single-crystal X-ray diffraction and X-ray powder diffraction studies suggest that Cu2Se and Cu2S can form a continuous solid solution in the entire composition range. These Cu2Se1-xSxsolid solutions are polymorphic materials composed of varied phases with different proportions at room temperature, but single phase materials at elevated temperature. Increasing the sulfur content in Cu2Se1-xSxsolid solutions can greatly reduce the carrier concentration, leading to much enhanced electrical resistivity and Seebeck coefficients in the whole temperature range as compared with those in binary Cu2Se. In particular, introducing sulfur at Se-sites reduces the speed of sound. Combining the strengthened point defect scattering of phonons, extremely low lattice thermal conductivities are obtained in these solid solutions. Finally, a maximum zT value of 1.65 at 950 K is achieved for Cu2Se0.8S0.2, which is greater than those of Cu2Se and Cu2S. © 2017 The Royal Society of Chemistry.
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/25556]
专题	中国科学院上海硅酸盐研究所
作者单位	1.State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai; 200050, China; 2.University of Chinese Academy of Sciences, Beijing; 100049, China; 3.Centre for Materials Crystallography, Department of Chemistry and INANO, Aarhus University, Langelandsgade 140, Aarhus C; DK-8000, Denmark; 4.Department of Materials Science and Engineering, Norwegian University of Science and Technology, Trondheim; N-7491, Norway; 5.Danish Technological Institute, Centre for Nano Production and Micro Analysis, Taastrup; DK-2630, Denmark
推荐引用方式 GB/T 7714	Zhao, Kunpeng,Blichfeld, Anders Bank,Eikeland, Espen,et al. Extremely low thermal conductivity and high thermoelectric performance in liquid-like Cu2Se1-: XSxpolymorphic materials[J]. Journal of Materials Chemistry A,2017,5(34):18148-18156.
APA	Zhao, Kunpeng.,Blichfeld, Anders Bank.,Eikeland, Espen.,Qiu, Pengfei.,Ren, Dudi.,...&Chen, Lidong.(2017).Extremely low thermal conductivity and high thermoelectric performance in liquid-like Cu2Se1-: XSxpolymorphic materials.Journal of Materials Chemistry A,5(34),18148-18156.
MLA	Zhao, Kunpeng,et al."Extremely low thermal conductivity and high thermoelectric performance in liquid-like Cu2Se1-: XSxpolymorphic materials".Journal of Materials Chemistry A 5.34(2017):18148-18156.