Optimizing thermoelectric properties of BiSe through Cu additive enhanced effective mass and phonon scattering

doi:10.1007/s12598-020-01491-5

	Optimizing thermoelectric properties of BiSe through Cu additive enhanced effective mass and phonon scattering
	Shen, Xing-Chen 1,2,5; Zhang, Xiao 3; Zhang, Bin 3; Wang, Guo-Yu 1,4; He, Jian 2; Zhou, Xiao-Yuan 3,5
刊名	RARE METALS
	2020-07-17
页码	9
关键词	Cu additives Phonon scattering Effective mass Texture Thermoelectric
ISSN号	1001-0521
DOI	10.1007/s12598-020-01491-5
通讯作者	Zhou, Xiao-Yuan(xiaoyuan2013@cqu.edu.cn)
英文摘要	Known as a weak topological insulator (TI), BiSe structurally exhibits alternating stacks of quantum spin Hall bilayer ("Bi-2") and three-dimensional TI layer ("Bi2Se3"). The low lattice thermal conductivity of BiSe due to the presence of Bi(2)bilayers promises potentially good thermoelectric performance. Herein, the thermoelectric properties of nominal Bi1-xCuxSe samples were studied as the functions of the content of Cu additive and temperature. It is found that Cu additives in BiSe (1) profoundly affect the texture of densified polycrystalline samples by inclining the crystallographicc-axis parallel toward the pressure direction in the densification process, (2) increase considerably the effective mass and thus the Seebeck coefficient, and (3) yield point defects and Cu-Se secondary phases that effectively scatter heat-carrying phonons. As a result, the optimized electrical and thermal properties yield a thermoelectric figure of merit ofzT similar to 0.29 in Bi1-xCuxSe (x = 0.03) sample at 467 K in parallel to the pressure direction and azT similar to 0.20 at 468 K in the perpendicular direction. Graphic abstract
资助项目	Graduate Scientific Research and Innovation Foundation of Chongqing, China[CYB 19064] ; National Natural Science Foundation of China[51772035] ; National Natural Science Foundation of China[11674040] ; National Natural Science Foundation of China[51472036] ; National Natural Science Foundation of China[51672270] ; Fundamental Research Funds for the Central Universities[106112017CDJQJ308821] ; Key Research Program of Frontier Sciences, CAS[QYZDB-SSW-SLH016] ; CSC Scholarship[201806050180] ; 2019 ITS Summer Fellowship ; Natural Science Foundation of Chongqing, China[cstc2019jcyj-msxmX0554] ; Chongqing University
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	NONFERROUS METALS SOC CHINA
WOS记录号	WOS:000549669500003
内容类型	期刊论文
源URL	[http://119.78.100.138/handle/2HOD01W0/11341]
专题	中国科学院重庆绿色智能技术研究院
通讯作者	Zhou, Xiao-Yuan
作者单位	1.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China 2.Clemson Univ, Dept Phys & Astron, Clemson, SC 29634 USA 3.Chongqing Univ, Analyt & Testing Ctr, Chongqing 401331, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100044, Peoples R China 5.Chongqing Univ, Coll Phys, Chongqing Key Lab Soft Condensed Matter Phys & Sm, Chongqing 401331, Peoples R China
推荐引用方式 GB/T 7714	Shen, Xing-Chen,Zhang, Xiao,Zhang, Bin,et al. Optimizing thermoelectric properties of BiSe through Cu additive enhanced effective mass and phonon scattering[J]. RARE METALS,2020:9.
APA	Shen, Xing-Chen,Zhang, Xiao,Zhang, Bin,Wang, Guo-Yu,He, Jian,&Zhou, Xiao-Yuan.(2020).Optimizing thermoelectric properties of BiSe through Cu additive enhanced effective mass and phonon scattering.RARE METALS,9.
MLA	Shen, Xing-Chen,et al."Optimizing thermoelectric properties of BiSe through Cu additive enhanced effective mass and phonon scattering".RARE METALS (2020):9.