Investigation of thermal transport degradation in rough Si nanowires

Luisier, Mathieu

doi:10.1063/1.3644993

Title: Investigation of thermal transport degradation in rough Si nanowires

Journal Article · Wed Oct 05 00:00:00 EDT 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3644993· OSTI ID:1564851

Luisier, Mathieu ^[1]

Federal Inst. of Technology, Zurich (Switzerland)

Thermal transport through $$\langle$$100$$\rangle$$ and $$\langle$$110$$\rangle$$ rough Si nanowires is explored using an atomistic quantum transport approach based on a modified Keating model and the wave function formalism. The thermal conductance, resistance, and conductivity are calculated for different nanowire lengths and the root mean square of the rough surfaces. The simulation results reflect that thermal transport is diffusive in rough nanowires without surrounding oxide layers. Its degradation, as compared to ideal structures, cannot be attributed to phonon localization effects, but to the properties of the phonon band structure. Phonon bands with an almost flat dispersion cannot propagate through disordered structures because of the mode mismatch between adjacent unit cells.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1564851

Journal Information:: Journal of Applied Physics, Vol. 110, Issue 7; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 28 works

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Cited By (5)

Thermal transport and Matthiessen's rule in ultra-scaled Si nanowires Luisier, Mathieu Applied Physics Letters, Vol. 103, Issue 11 https://doi.org/10.1063/1.4821117	journal	September 2013
Roughness and amorphization impact on thermal conductivity of nanofilms and nanowires: Making atomistic modeling more realistic Verdier, Maxime; Lacroix, David; Termentzidis, Konstantinos Journal of Applied Physics, Vol. 126, Issue 16 https://doi.org/10.1063/1.5108618	journal	October 2019
Low-dimensional phonon transport effects in ultranarrow disordered graphene nanoribbons Karamitaheri, Hossein; Pourfath, Mahdi; Kosina, Hans Physical Review B, Vol. 91, Issue 16 https://doi.org/10.1103/physrevb.91.165410	journal	April 2015
Thermal conductivity in porous silicon nanowire arrays Weisse, Jeffrey M.; Marconnet, Amy M.; Kim, Dong Nanoscale Research Letters, Vol. 7, Issue 1 https://doi.org/10.1186/1556-276x-7-554	journal	January 2012
Phonon transport simulations in low-dimensional, disordered graphene nanoribbons Neophytou, Neophytos; Karamitaheri, Hossein 2015 IEEE 15th International Conference on Nanotechnology (IEEE-NANO) https://doi.org/10.1109/nano.2015.7388674	conference	July 2015

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