TITLE

Phonon backscattering and thermal conductivity suppression in sawtooth nanowires

AUTHOR(S)
Moore, Arden L.; Saha, Sanjoy K.; Prasher, Ravi S.; Shi, Li
PUB. DATE
August 2008
SOURCE
Applied Physics Letters;8/25/2008, Vol. 93 Issue 8, p083112
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
34198829

 

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