Effects of grain boundary cavities on the thermal resistance under ultrashort laser pulse

Kun Yan, Ai Kah Soh

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Abstract

Molecular dynamics simulations were carried out for nonequilibrium phonon heat transport across the Si Σ = 5, (3 1 0) symmetric tilt grain boundaries subjected to an ultrashort laser pulse. It has been found that the existence of cavities at the grain boundary will increase the grain boundary potential energy and decrease the heat dissipation, which is evident from the approximately 20% longer relaxation time required for the system to reach thermodynamic equilibrium. Thus, the existence of grain boundary cavities is one of the main hindrances in the thermal management of nanostructures.

Original languageEnglish
Article number155401
JournalJournal of Physics D: Applied Physics
Volume41
Issue number15
DOIs
Publication statusPublished - 7 Aug 2008
Externally publishedYes

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