In-plane thermal conductivity of disordered layered WSe2 and (W)x(WSe2)y superlattice films

It was recently reported that misoriented layered WSe2 and (W)x(WSe2)y films possess extremely low cross-plane thermal conductivity. Here, we report that the in-plane thermal conductivity results for WSe2 and W4(WSe2)10 films measured by using a suspended device are about 30 times higher than the cr...

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Veröffentlicht in:Applied physics letters 2007-10, Vol.91 (17)
Hauptverfasser: Mavrokefalos, Anastassios, Nguyen, Ngoc T., Pettes, Michael T., Johnson, David C., Shi, Li
Format: Artikel
Sprache:eng ; jpn
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Zusammenfassung:It was recently reported that misoriented layered WSe2 and (W)x(WSe2)y films possess extremely low cross-plane thermal conductivity. Here, we report that the in-plane thermal conductivity results for WSe2 and W4(WSe2)10 films measured by using a suspended device are about 30 times higher than the cross-plane values because of the in-plane ordered and cross-plane disordered structures and about six times lower than that of compacted single-crystal WSe2 platelets. The additional W layers in the W4(WSe2)10 films were found to greatly increase the in-plane electrical conductivity relative to the WSe2 films, but reduce the in-plane lattice thermal conductivity assuming the Wiedemann-Franz law.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2800888