Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 7, Pages 2603-2610Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b00393
Keywords
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Funding
- National Natural Science Foundation of China [51772215, 51809161, 51671125]
- Nature Science Foundation of Shanghai [16ZR1412800, 18ZR1416000]
- Shanghai Engineering Technology Research Center [18DZ2253400]
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Recently, polycrystalline argyrodite Ag8SnSe6 has shown promising thermoelectric performance, which largely relies on the ultralow lattice thermal conductivity. However, the thermoelectric properties of single-crystalline Ag8SnSe6 have been unavailable so far. In this work, Ag8SnSe6 single crystals, with a highly preferred orientation of (110), are grown by a vertical Bridgman technique. Thermoelectric properties parallel and perpendicular to this direction are investigated, revealing a similar to 40% higher hall mobility but a very similar lattice thermal conductivity in single crystals as compared to that in polycrystals. Both transport and elastic properties are found to be nearly isotropic, even for the low-temperature phase with an anisotropic structure. This work, for the first time, not only successfully synthesizes high-quality single-crystal Ag8SnSe6 but also enables a fundamental understanding on the materials physics.
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