Regensburg 2019 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 10: Thermoelectric and Phase Change Materials

DS 10.3: Vortrag

Montag, 1. April 2019, 17:15–17:30, H39

Phonon modes and thermal conductivity in Si/SiO2 multishell nanotubesC. I. Isacova1, A. I. Cocemasov1, D. L. Nika1, O. G. Schmidt2, and •V. M. Fomin1,21E. P. Pokatilov Laboratory of Physics and Engineering of Nanomaterials, Moldova State University, Chisinau MD-2009, Republic of Moldova — 2Institute for Integrative Nanosciences, Leibniz IFW Dresden, Dresden D-01069, Germany

Theoretical atomistic study of thermal transport is conducted for Si/SiO2 multishell nanotubes, which model rolled-up Si/SiO2 nanostructures. Phonon modes are obtained within Lattice Dynamics Theory. Thermal conductivity in Si/SiO2 nanotubes, as calculated using Boltzmann Transport Equation within the relaxation-time approximation, is lower than that in Si nanowires with the same lateral dimensions due to the acoustical mismatch of the materials and a stronger phonon confinement. A large number of phonon modes are scattered on Si/SiO2 interfaces, what enhances the effect of the boundary scattering mechanism on thermal conductivity of multishell nanotubes. Thermal conductivity is found to decrease almost linearly as a function of the number of Si/SiO2 bilayers in multishell nanotubes. The present work is supported by the DFG grant no. FO 956/4-1.

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