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Thermal properties of amorphous/crystalline silicon superlattices

Abstract : Thermal transport properties of crystalline/amorphous silicon superlattices using molecular dynamics are investigated. We show that the cross-plane conductivity of the superlattices is very low and close to the conductivity of bulk amorphous silicon even for amorphous layers as thin as ≃6 Å. The cross-plane thermal conductivity weakly increases with temperature which is associated with a decrease of the Kapitza resistance with temperature at the crystalline/amorphous interface. This property is further investigated considering the spatial analysis of the phonon density of states in domains close to the interface. Interestingly, the crystalline/amorphous superlattices are shown to display large thermal anisotropy, according to the characteristic sizes of elaborated structures. These last results suggest that the thermal conductivity of crystalline/amorphous superlattices can be phonon engineered, providing new directions for nanostructured thermoelectrics and anisotropic materials in thermal transport.
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Arthur France-Lanord, Samy Merabia, Tristan Albaret, David Lacroix, Konstantinos Termentzidis. Thermal properties of amorphous/crystalline silicon superlattices. Journal of Physics: Condensed Matter, IOP Publishing, 2014, 26 (35), pp.355801. ⟨10.1088/0953-8984/26/35/355801⟩. ⟨hal-01418372⟩



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