Thermal conductivity in porous silicon nanowire arrays

Thermal conductivity in porous silicon nanowire arrays

The nanoscale features in silicon nanowires (SiNWs) can suppress phonon propagation and strongly reduce their thermal conductivities compared to the bulk value. This work measures the thermal conductivity along the axial direction of SiNW arrays with varying nanowire diameters, doping concentrations...

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Main Authors: Weisse, Jeffrey M, Marconnet, Amy M, Kim, Dong Rip, Rao, Pratap M, Panzer, Matthew A, Goodson, Kenneth E, Zheng, Xiaolin
Format: Online
Language:English
Published: Springer 2012
Online Access:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3494563/
id pubmed-3494563
recordtype oai_dc
spelling pubmed-34945632012-11-13 Thermal conductivity in porous silicon nanowire arrays Weisse, Jeffrey M Marconnet, Amy M Kim, Dong Rip Rao, Pratap M Panzer, Matthew A Goodson, Kenneth E Zheng, Xiaolin Nano Express The nanoscale features in silicon nanowires (SiNWs) can suppress phonon propagation and strongly reduce their thermal conductivities compared to the bulk value. This work measures the thermal conductivity along the axial direction of SiNW arrays with varying nanowire diameters, doping concentrations, surface roughness, and internal porosities using nanosecond transient thermoreflectance. For SiNWs with diameters larger than the phonon mean free path, porosity substantially reduces the thermal conductivity, yielding thermal conductivities as low as 1 W/m/K in highly porous SiNWs. However, when the SiNW diameter is below the phonon mean free path, both the internal porosity and the diameter significantly contribute to phonon scattering and lead to reduced thermal conductivity of the SiNWs. Springer 2012-10-06 /pmc/articles/PMC3494563/ /pubmed/23039084 http://dx.doi.org/10.1186/1556-276X-7-554 Text en Copyright ©2012 Weisse et al.; licensee Springer. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
repository_type Open Access Journal
institution_category Foreign Institution
institution US National Center for Biotechnology Information
building NCBI PubMed
collection Online Access
language English
format Online
author Weisse, Jeffrey M
Marconnet, Amy M
Kim, Dong Rip
Rao, Pratap M
Panzer, Matthew A
Goodson, Kenneth E
Zheng, Xiaolin
spellingShingle Weisse, Jeffrey M
Marconnet, Amy M
Kim, Dong Rip
Rao, Pratap M
Panzer, Matthew A
Goodson, Kenneth E
Zheng, Xiaolin
Thermal conductivity in porous silicon nanowire arrays
author_facet Weisse, Jeffrey M
Marconnet, Amy M
Kim, Dong Rip
Rao, Pratap M
Panzer, Matthew A
Goodson, Kenneth E
Zheng, Xiaolin
author_sort Weisse, Jeffrey M
title Thermal conductivity in porous silicon nanowire arrays
title_short Thermal conductivity in porous silicon nanowire arrays
title_full Thermal conductivity in porous silicon nanowire arrays
title_fullStr Thermal conductivity in porous silicon nanowire arrays
title_full_unstemmed Thermal conductivity in porous silicon nanowire arrays
title_sort thermal conductivity in porous silicon nanowire arrays
description The nanoscale features in silicon nanowires (SiNWs) can suppress phonon propagation and strongly reduce their thermal conductivities compared to the bulk value. This work measures the thermal conductivity along the axial direction of SiNW arrays with varying nanowire diameters, doping concentrations, surface roughness, and internal porosities using nanosecond transient thermoreflectance. For SiNWs with diameters larger than the phonon mean free path, porosity substantially reduces the thermal conductivity, yielding thermal conductivities as low as 1 W/m/K in highly porous SiNWs. However, when the SiNW diameter is below the phonon mean free path, both the internal porosity and the diameter significantly contribute to phonon scattering and lead to reduced thermal conductivity of the SiNWs.
publisher Springer
publishDate 2012
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3494563/
_version_ 1611923169519599616

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