Frequency-dependent Monte Carlo simulations of phonon transport in two-dimensional porous silicon with aligned pores

Qing Hao, Gang Chen, Ming Shan Jeng

Research output: Contribution to journalArticlepeer-review

157 Scopus citations

Abstract

In this work, phonon transport in two-dimensional (2D) porous silicon structures with aligned pores is investigated by Monte Carlo simulations considering the frequency-dependent phonon mean free paths (MFPs). A boundary condition based on the periodic heat flux with constant virtual wall temperature is developed for the studied periodic structures. Such periodic boundary conditions enable the simulation of the lattice thermal conductivities with a minimum computational domain. For the 2D case, it is found that phonon size effects caused by the periodically arranged pores can be remarkable even when the pore size and spacing are much larger than the averaged phonon MFPs. Our results show the importance of considering the frequency dependence of phonon MFPs in the analysis of micro- and nanostructured materials.

Original languageEnglish (US)
Article number114321
JournalJournal of Applied Physics
Volume106
Issue number11
DOIs
StatePublished - Dec 28 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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