Strategy to optimize the overall thermoelectric properties of SnTe via compositing with its property-counter CuInTe2

被引：57

作者：

Zhou, Y. M. ^{[1
]}

Wu, H. J. ^{[2
,3
,4
]}

Pei, Y. L. ^{[1
]}

Chang, C. ^{[1
]}

Xiao, Y. ^{[1
]}

Zhang, X. ^{[1
]}

Gong, S. K. ^{[1
]}

He, J. Q. ^{[2
,3
]}

Zhao, L. -D. ^{[1
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

[2] South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China

[3] Shenzhen Key Lab Thermoelect Mat, Shenzhen 518055, Peoples R China

[4] Natl Univ Singapore, Dept Mat Sci & Engn, 7 Engn Dr 1, Singapore 117575, Singapore

来源：

ACTA MATERIALIA | 2017年 / 125卷

基金：

中国国家自然科学基金;

关键词：

Thermoelectric; SnTe; Composite; Nanostructure; LOW THERMAL-CONDUCTIVITY; PERFORMANCE BULK THERMOELECTRICS; VALENCE-BAND CONVERGENCE; DOPED LEAD-TELLURIDE; ELECTRONIC-STRUCTURE; PHONON-SCATTERING; POWER-FACTOR; ENHANCEMENT; SYSTEM; FIGURE;

D O I：

10.1016/j.actamat.2016.11.049

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

SnTe, a lead-free analogue of PbTe, exhibits inferior thermoelectric performance due to its intrinsically high carrier concentration, and thus too low Seebeck coefficient and high thermal conductivity. To optimize the overall properties of SnTe, we composited SnTe with the other compound with opposite performance. CuInTe2 is a good choice due to its low carrier concentration, high Seebeck coefficient and relatively low thermal conductivity. As a result, the most optimized properties can be obtained in CuSnmInTem+2 when m = 7, and an enhanced figure of merit ZTcan be obtained, similar to 1.0 at 873 K, which is a three-fold increase for pure CuInTe2 and one-fold increase for pure SnTe. The overall properties are optimized much greater than the expectation, which was estimated through Effective Medium Theory (EMT). Such deviation can be ascribed to the existence of high density of coherent nanostructures. (C) 2016 Published by Elsevier Ltd on behalf of Acta Materialia Inc.

引用

页码：542 / 549

页数：8

共 6 条

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