期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 6, 期 37, 页码 10083-10087出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc03051k
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资金
- National Research Foundation of Korea (NRF) - Korea government [NRF-2018R1A5A1025594, NRF-2017M2A2A6A01071012]
Tin selenide (Sn1-xSe) polycrystalline thin films were prepared by thermal co-evaporation, and the thermoelectric properties of the Sn1-xSe thin films were investigated. We found that a stoichiometric SnSe thin film has a lower thermal conductivity than the bulk form of SnSe reported in the literature. As the composition deviated from the stoichiometry (i.e., x > 0), interesting changes in thermal conductivity were observed: a general trend of increasing thermal conductivity with increasing x except that the lowest thermal conductivity was observed when x similar to 0.3. Two factors are identified to influence the dependence of thermal conductivity on the composition: a portion of the SnSe2 phase that has a higher thermal conductivity than SnSe and the density of the SnSe/SnSe2 interface, which is expected to be effective in phonon scattering because of a higher Kapitza resistance. An interplay between these two factors leads to the minimum thermal conductivity at x similar to 0.3. Our study provides new strategies that can potentially lead to the improved thermoelectric performance of SnSe: use of thin films and careful control of the composition.
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