Journal
SCRIPTA MATERIALIA
Volume 147, Issue -, Pages 74-78Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.12.035
Keywords
Thermoelectric materials; Thermoelectric performance; Thermal conductivity
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Funding
- National Natural Science Foundation of China [U1732153, 51672278]
- Natural Science Foundation of Jiangsu Province [BK20161495]
- Fundamental Research Funds for the Central Universities [30917011206]
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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.
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