Wolf, Stefanie, Neophytou, Neophytos and Kosina, Hans (2014) Thermal conductivity of silicon nanomeshes : effects of porosity and roughness. Journal of Applied Physics, Volume 115 (Number 20). Article number 204306. doi:10.1063/1.4879242 ISSN 0021-8979.

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Abstract

We theoretically investigate thermal conductivity in silicon nanomeshes using Monte Carlo simulations of phonon transport. Silicon membranes of 100 nm thickness with randomly located pores of 50 nm diameter are considered. The effects of material porosity and pore surface roughness are examined. Nanomesh porosity is found to have a strong detrimental effect on thermal conductivity. At room temperature, a porosity of 50% results in ∼80% reduction in thermal conductivity. Boundary roughness scattering further degrades thermal conductivity, but its effect is weaker. Thermal transport can additionally be affected by the specific arrangement of the pores along the transport direction.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title:	Journal of Applied Physics
Publisher:	American Institute of Physics
ISSN:	0021-8979
Official Date:	28 May 2014
Dates:	Date Event 28 May 2014 Published 27 May 2014 Available 11 May 2014 Accepted 13 February 2014 Submitted
Volume:	Volume 115
Number:	Number 20
Article Number:	Article number 204306
DOI:	10.1063/1.4879242
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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