Sn1-xSe thin films with low thermal conductivity: role of stoichiometric deviation in thermal transport

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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.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2018-10
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS CHEMISTRY C, v.6, no.37, pp.10083 - 10087

ISSN
2050-7526
DOI
10.1039/c8tc03051k
URI
http://hdl.handle.net/10203/247133
Appears in Collection
MS-Journal Papers(저널논문)
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