In-Plane Thermal Conductivity of Disordered Layered WSe2 and (W)x(WSe2)y Superlattice Films

Citation:

A. Mavrokefalos, Nguyen, N. T., Pettes, M. T., Johnson, D. C., and Shi, L., “In-Plane Thermal Conductivity of Disordered Layered WSe2 and (W)x(WSe2)y Superlattice Films,” Appl. Phys. Lett., vol. 91, pp. 17912, 2007.

Abstract:

It was recently reported that misoriented layered WSe2 and (W)x(WSe2)yfilms possess extremely low cross-plane thermal conductivity. Here, we report that the in-plane thermal conductivity results for WSe2 and W4(WSe2)10films 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-crystalWSe2 platelets. The additional W layers in the W4(WSe2)10films were found to greatly increase the in-plane electrical conductivity relative to the WSe2films, but reduce the in-plane lattice thermal conductivity assuming the Wiedemann-Franz law.

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