Phonon backscattering and thermal conductivity suppression in sawtooth nanowires

Phonon backscattering and thermal conductivity suppression in sawtooth nanowires

TitlePhonon backscattering and thermal conductivity suppression in sawtooth nanowires
Publication TypeJournal Article
Year of Publication2008
AuthorsA L Moore, S K Saha, Ravi S Prasher, L Shi
JournalAppl. Phys. Lett.
Date Published08/2008
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)(p) in the range between 0 and 1. A lower thermal conductivity limit is approached at p=0p=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 ppif the detail of the surface roughness is ignored.

DOI10.1063/1.2970044