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|Title:||High thermoelectric performance in polycrystalline SnSe via dual‐doping with Ag/Na and nanostructuring with Ag8SnSe6||Authors:||Luo, Yubo
Dravid, Vinayak P.
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.||URI:||https://hdl.handle.net/10356/139256||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|
|Appears in Collections:||MSE Journal Articles|
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