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Title: High thermoelectric performance in polycrystalline SnSe via dual‐doping with Ag/Na and nanostructuring with Ag8SnSe6
Authors: Luo, Yubo
Cai, Songting
Hua, Xia
Chen, Haijie
Liang, Qinghua
Du, Chengfeng
Zheng, Yun
Shen, Junhua
Xu, Jianwei
Wolverton, Chris
Dravid, Vinayak P.
Yan, Qingyu
Kanatzidis, Mercouri G.
Keywords: Engineering::Materials
Issue Date: 2018
Source: Luo, Y., Cai, S., Hua, X., Chen, H., Liang, Q., Du, C., . . . Kanatzidis, M. G. (2019). High thermoelectric performance in polycrystalline SnSe via dual‐doping with Ag/Na and nanostructuring with Ag8SnSe6. Advanced Energy Materials, 9(2), 1803072-. doi:10.1002/aenm.201803072
Journal: Advanced Energy Materials
Abstract: Single crystalline SnSe is one of the most intriguing new thermoelectric materials but the thermoelectric performance of polycrystalline SnSe seems to lag significantly compared to that of a single crystal. Here an effective strategy for enhancing the thermoelectric performance of p‐type polycrystalline SnSe by Ag/Na dual‐doping and Ag8SnSe6 (STSe) nanoprecipitates is reported. The Ag/Na dual‐doping leads to a two orders of magnitude increase in carrier concentration and a convergence of valence bands (VBM1 and VBM5), which in turn results in sharp enhancement of electrical conductivities and high Seebeck coefficients in the Ag/Na dual‐doped samples. Additionally, the SnSe matrix becomes nanostructured with dispersed nanoprecipitates of the compound Ag8SnSe6, which further strengthens the scattering of phonons. Specifically, ≈20% reduction in the already ultralow lattice thermal conductivity is realized for the Sn0.99Na0.01Se–STSe sample at 773 K compared to the thermal conductivity of pure SnSe. Consequently, a peak thermoelectric figure of merit ZT of 1.33 at 773 K with a high average ZT (ZTave) value of 0.91 (423–823 K) is achieved for the Sn0.99Na0.01Se–STSe sample.
ISSN: 1614-6832
DOI: 10.1002/aenm.201803072
Rights: © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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