气候变化领域集成服务门户(CCPortal): Synergistic modulation of mobility and thermal conductivity in (Bi,Sb) 2 Te 3 towards high thermoelectric performance

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DOI	10.1039/c8ee03225d
	Synergistic modulation of mobility and thermal conductivity in (Bi,Sb) 2 Te 3 towards high thermoelectric performance
	Pan Y.; Qiu Y.; Witting I.; Zhang L.; Fu C.; Li J.-W.; Huang Y.; Sun F.-H.; He J.; Snyder G.J.; Felser C.; Li J.-F.
发表日期	2019
ISSN	17545692
起始页码	624
结束页码	630
卷号	12 期号:2
英文摘要	Modulating microstructures in a wide range from atomic defects to microscale structures independently can partially decouple the transport of charge carriers and phonons and thus enhance the figure of merit (zT) of thermoelectric materials. High mobility requires atomic scale purity, while introducing nanoscopic inhomogeneities leads to low thermal conductivity. Through a two-step sintering process with excess Te, lower reduction of mobility and decreased thermal conductivity were simultaneously achieved in (Bi,Sb) 2 Te 3 . Grain boundaries and defects that strongly impede charge carrier transport are reduced by the two-step sintering process leading to a higher mobility compared to that of the one-step sintered bulk. At the same time, removal of Te as well as Sb-rich inhomogeneities with lattice misfit to the matrix decreased the thermal conductivity. In this way, simultaneous maintenance of high mobility and low lattice thermal conductivity was illustrated. By further optimization of carrier concentration, the produced material showed an encouraging zT value of 1.38 at 323 K. The present work demonstrates a method for synthesizing high-efficiency thermoelectric materials through simultaneous optimization of the electrical and thermal transport properties. © 2019 The Royal Society of Chemistry.
英文关键词	Carrier concentration; Carrier transport; Grain boundaries; Sintering; Thermoelectric equipment; Thermoelectricity; Lattice thermal conductivity; Low thermal conductivity; Micro-scale structures; Simultaneous optimization; Thermal transport properties; Thermo-Electric materials; Thermoelectric performance; Two-step sintering process; Thermal conductivity; efficiency measurement; inorganic compound; maintenance; matrix; optimization; performance assessment; reduction; thermal conductivity
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189994
作者单位	State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China; Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden, 01187, Germany; Department of Physics, South University of Science and Technology of China, Shenzhen, 518055, China; Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States
推荐引用方式 GB/T 7714	Pan Y.,Qiu Y.,Witting I.,et al. Synergistic modulation of mobility and thermal conductivity in (Bi,Sb) 2 Te 3 towards high thermoelectric performance[J],2019,12(2).
APA	Pan Y..,Qiu Y..,Witting I..,Zhang L..,Fu C..,...&Li J.-F..(2019).Synergistic modulation of mobility and thermal conductivity in (Bi,Sb) 2 Te 3 towards high thermoelectric performance.Energy & Environmental Science,12(2).
MLA	Pan Y.,et al."Synergistic modulation of mobility and thermal conductivity in (Bi,Sb) 2 Te 3 towards high thermoelectric performance".Energy & Environmental Science 12.2(2019).