Improved Thermoelectric Performance in Nonstoichiometric Cu2+delta Mn1-delta SnSe4 Quaternary Diamondlike Compounds

doi:10.1021/acsami.7b19791

	Improved Thermoelectric Performance in Nonstoichiometric Cu2+delta Mn1-delta SnSe4 Quaternary Diamondlike Compounds
	Song, Qingfeng 1; Qiu, Pengfei ; Chen, Hongyi 1,2; Zhao, Kunpeng 1; Ren, Dudi ; Shi, Xun ; Chen, Lidong
刊名	ACS APPLIED MATERIALS & INTERFACES
	2018
卷号	10 期号:12 页码:10123
关键词	thermoelectric diamondlike nonstoichiometric doping refinement
ISSN号	1944-8244
DOI	10.1021/acsami.7b19791
英文摘要	A novel quaternary Cu2MnSnSe4 diamondlike thermoelectric material was discovered recently based on the pseudocubic structure engineering. In this study, we show that introducing off-stoichiometry in Cu2MnSnSe4 effectively enhances its thermoelectric performance by simultaneously optimizing the carrier concentrations and suppressing the lattice thermal conductivity. A series of nonstoichiometric Cu2+delta Mn1-delta SnSe4 (delta = 0, 0.025, 0.05, 0.075, and 0.1) samples has been prepared by the melting-annealing method. The X-ray analysis and the scanning electron microscopy measurement show that all nonstoichiometric samples are phase pure. The Rietveld refinement demonstrates that substituting part of Mn by Cu well maintains the structure distortion parameter eta close to 1, but it induces obvious local distortions inside the anion-centered tetrahedrons. Significantly improved carrier concentrations are observed in these nonstoichiometric Cu2+delta Mn1-delta SnSe4 samples, pushing the power factors to the theoretical maximal value predicted by the single parabolic model. Substituting part of Mn by Cu also reduces the lattice thermal conductivity, which is well interpreted by the Callaway model. Finally, a maximal thermoelectric dimensionless figure-of-merit zT around 0.60 at 800 K has been obtained in Cu2.1Mn0.9SnSe4, which is about 33% higher than that in the Cu2+delta Mn1-delta SnSe4 matrix compound.
学科主题	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000428972700027
资助机构	This work was financially supported by the National Natural Science Foundation of China (NSFC) under the No. 51625205, the Key Research Program of Chinese Academy of Sciences (Grant No. KFZD-SW-421), International S&T Cooperation Program of China (2015DFA51050), and the Shanghai Government (Grant Nos. 15JC1400301 and 16XD1403900). ; This work was financially supported by the National Natural Science Foundation of China (NSFC) under the No. 51625205, the Key Research Program of Chinese Academy of Sciences (Grant No. KFZD-SW-421), International S&T Cooperation Program of China (2015DFA51050), and the Shanghai Government (Grant Nos. 15JC1400301 and 16XD1403900).
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/25077]
专题	中国科学院上海硅酸盐研究所
作者单位	1.Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China
推荐引用方式 GB/T 7714	Song, Qingfeng,Qiu, Pengfei,Chen, Hongyi,et al. Improved Thermoelectric Performance in Nonstoichiometric Cu2+delta Mn1-delta SnSe4 Quaternary Diamondlike Compounds[J]. ACS APPLIED MATERIALS & INTERFACES,2018,10(12):10123, 10131.
APA	Song, Qingfeng.,Qiu, Pengfei.,Chen, Hongyi.,Zhao, Kunpeng.,Ren, Dudi.,...&Chen, Lidong.(2018).Improved Thermoelectric Performance in Nonstoichiometric Cu2+delta Mn1-delta SnSe4 Quaternary Diamondlike Compounds.ACS APPLIED MATERIALS & INTERFACES,10(12),10123.
MLA	Song, Qingfeng,et al."Improved Thermoelectric Performance in Nonstoichiometric Cu2+delta Mn1-delta SnSe4 Quaternary Diamondlike Compounds".ACS APPLIED MATERIALS & INTERFACES 10.12(2018):10123.