期刊
ADVANCED ENERGY MATERIALS
卷 9, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201803072
关键词
Ag8SnSe6; dual-doping; nanostructuring; SnSe; thermoelectrics
类别
资金
- Department of Energy, Office of Science Basic Energy Sciences, DOE Office of Science [DE-SC0014520]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF ECCS-1542205]
- MRSEC program at the Materials Research Center [NSF DMR-1720139]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the IIN
- Office of Science of the U.S. Department of Energy [DE-AC02-06CH11357, DE-AC02-05CH11231]
- National Natural Science Foundation of China [61728401]
- Singapore MOE AcRF Tier 1 [2016-T1-002-065]
- Singapore MOE Tier 2 [2018-T2-010]
- Singapore A*STAR Pharos Program [SERC 1527200021, 1527200022]
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, approximate to 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 (ZT(ave)) value of 0.91 (423-823 K) is achieved for the Sn0.99Na0.01Se-STSe sample.
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