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Multiple Effects Promoting the Thermoelectric Performance of SnTe by Alloying with CuSbTe2 and CuBiTe2

文献类型：期刊论文

作者He, Wenlu1; Li, Nanhai1,2; Wang, Huan1; Wang, Guiwen3; Wang, Guoyu2; Lu, Xu1; Zhou, Xiaoyuan1,3
刊名ACS APPLIED MATERIALS & INTERFACES
出版日期2021-11-10
卷号13期号:44页码:52775-52782
关键词solid solutions thermoelectrics band convergence transport coefficients weighted mobility carrier concentration
ISSN号1944-8244
DOI10.1021/acsami.1c15614
通讯作者Wang, Guiwen(gwwang@cqu.edu.cn) ; Wang, Guoyu(guoyuw@cigit.ac.cn) ; Lu, Xu(luxu@cqu.edu.cn)
英文摘要In a SnTe-based thermoelectric material, the naturally high hole concentration caused by cation vacancies and high total thermal conductivity seriously hinder its thermoelectric performance. A recent work shows that alloying SnTe with other compounds from the I-V-VI2 family (I = Ag, Na; V = Sb, Bi; VI = Te) can be considered an effective strategy to boost the figure of merit efficiently via the synergy of manipulating hole concentration and lowering lattice thermal conductivity. Herein, we present a markedly enhanced thermoelectric performance in p-type SnTe through CuPnTe(2) (Pn = Sb, Bi) alloying. Moreover, we found that the alloying with both CuSbTe2 and CuBiTe2 can facilitate the valence band convergence of SnTe, but their relative influence is different. Interestingly, compared to CuBiTe2, alloying with CuSbTe2 increases the carrier concentration of SnTe, which suppresses the bipolar effect. Ultimately, under the positive effect of valence band convergence, increased vacancy concentration, and decreased lattice thermal conductivity, compounds with a nominal composition of (SnTe)(0.90)(CuSbTe2)(0.10) attains a peak zT of similar to 1.26 at 823 K. In contrast, the thermoelectric performance of (SnTe)(1-x)(CuBiTe2)(x) is restricted by the reduced carrier concentration and diminished band gap, showing only a humble maximum zT value of similar to 0.91 at 823 K in the sample with a nominal composition of (SnTe)(0.96)(CuBiTe2)(0.04). These results demonstrate the multiple effects on thermoelectric transport during the formation of complex solid solutions.
资助项目National Natural Science Foundation of China[51772035] ; National Natural Science Foundation of China[11874356] ; National Natural Science Foundation of China[51902237] ; Chongqing Entrepreneurship and Innovation Program for the Returned Overseas Chinese Scholars[cx2019002] ; Analytical and Testing Center of Chongqing University
WOS研究方向Science & Technology - Other Topics ; Materials Science
语种英语
WOS记录号WOS:000718271300092
出版者AMER CHEMICAL SOC
源URL[http://119.78.100.138/handle/2HOD01W0/14565]  
专题中国科学院重庆绿色智能技术研究院
通讯作者Wang, Guiwen; Wang, Guoyu; Lu, Xu
作者单位1.Chongqing Univ, Coll Phys, Chongqing Key Lab Soft Condensed Matter Phys & Sm, Chongqing 401331, Peoples R China
2.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China
3.Chongqing Univ, Analyt & Testing Ctr, Chongqing 401331, Peoples R China
推荐引用方式
GB/T 7714		 He, Wenlu,Li, Nanhai,Wang, Huan,et al. Multiple Effects Promoting the Thermoelectric Performance of SnTe by Alloying with CuSbTe2 and CuBiTe2[J]. ACS APPLIED MATERIALS & INTERFACES,2021,13(44):52775-52782.
APA He, Wenlu.,Li, Nanhai.,Wang, Huan.,Wang, Guiwen.,Wang, Guoyu.,...&Zhou, Xiaoyuan.(2021).Multiple Effects Promoting the Thermoelectric Performance of SnTe by Alloying with CuSbTe2 and CuBiTe2.ACS APPLIED MATERIALS & INTERFACES,13(44),52775-52782.
MLA He, Wenlu,et al."Multiple Effects Promoting the Thermoelectric Performance of SnTe by Alloying with CuSbTe2 and CuBiTe2".ACS APPLIED MATERIALS & INTERFACES 13.44(2021):52775-52782.

入库方式： OAI收割

来源：重庆绿色智能技术研究院

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