Extremely low thermal conductivity and enhanced thermoelectric performance of polycrystalline SnSe by Cu doping

被引：72
|
作者：
Gong, Yaru [1 ]
Chang, Cheng [2 ]
Wei, Wei [1 ]
Liu, Jiang [1 ]
Xiong, Wenjie [1 ]
Chai, Shuang [1 ]
Li, Di [3 ]
Zhang, Jian [3 ]
Tang, Guodong [1 ]
机构：
[1] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, MITT Key Lab Adv Metall & Intermetall Mat Technol, Nanjing 210094, Jiangsu, Peoples R China
[2] Beihang Univ, Sch Mat Sci & Engn, Beijing 10091, Peoples R China
[3] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Anhui, Peoples R China
来源：
SCRIPTA MATERIALIA | 2018年 / 147卷
基金：
中国国家自然科学基金;
关键词：
Thermoelectric materials; Thermoelectric performance; Thermal conductivity; TRANSPORT-PROPERTIES; HIGH FIGURE; MERIT;
D O I：
10.1016/j.scriptamat.2017.12.035
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Here, we systematically investigated the effect of Cu doping on the thermoelectric properties of SnSe prepared by hydrothermal synthesis. Low Cu doped content (x = 0.01) lead to enhanced electrical conductivity and power factor compared with reported polycrystalline SnSe. Nanoscale precipitates and mesoscale grains define all scale hierarchical architectures to scattering phonons. Furthermore, Cu atomic point-defect scattering play an important role in reducing the lattice thermal conductivity. These two favorable factors lead to low lattice thermal conductivity as low as 0.2 Wm(-1) K-1 at 873 K. This ultralow thermal conductivity results in a ZT of similar to 12 at 873 K in Cuo(0.01)Sn(0.99)Se. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：74 / 78
页数：5
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