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Phonon backscattering and thermal conductivity suppression in sawtooth nanowires

Appl. Phys. Lett. 93, 083112 (2008); doi:10.1063/1.2970044

Published 26 August 2008

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Arden L. Moore,1 Sanjoy K. Saha,2 Ravi S. Prasher,2,3 and Li Shi4
1Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA
2Intel Corporation, 5000 W. Chandler Blvd., Chandler, Arizona 85226, USA
3Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, Arizona 85287, USA
4Department of Mechanical Engineering and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, USA
The effect of surface roughness on phonon transport in a nanowire has often been described by treating the surface as flat with a specularity parameter (p) in the range between 0 and 1. A lower thermal conductivity limit is approached at p=0 for diffuse surface. It is demonstrated here by Monte Carlo simulation that sawtooth roughness on a nanowire can cause phonon backscattering and suppress the thermal conductivity below the diffuse surface limit. The backscattering effect can be accounted for only by a negative p if the detail of the surface roughness is ignored. ©2008 American Institute of Physics
History: Received 27 June 2008; accepted 24 July 2008; published 26 August 2008
Permalink: http://link.aip.org/link/?APPLAB/93/083112/1
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KEYWORDS and PACS

Keywords
PACS
  • 63.22.Gh
    Phonons and vibrational states in nanotubes and nanowires
  • 73.63.Bd
    Nanocrystalline materials (electronic transport)
  • 68.35.B-
    Structure of clean solid surfaces
  • 66.70.-f
    Nonelectronic thermal conduction and heat-pulse propagation in solids
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (14)
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