Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-05-14
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
32 pages, 11 figures, 2 tables. Paper presented at the 2009 ASME/Pacific Rim Technical Conference and Exhibition on Packaging
Scientific paper
We report finite-volume simulations of the phonon Boltzmann transport equation (BTE) for heat conduction across the heterogeneous interfaces in SiGe superlattices. The diffuse mismatch model incorporating phonon dispersion and polarization is implemented over a wide range of Knudsen numbers. The results indicate that the thermal conductivity of a Si/Ge superlattice is much lower than that of the constitutive bulk materials for superlattice periods in the submicron regime. We report results for effective thermal conductivity of various material volume fractions and superlattice periods. Details of the non-equilibrium energy exchange between optical and acoustic phonons that originate from the mismatch of phonon spectra in silicon and germanium are delineated for the first time. Conditions are identified for which this effect can produce significantly more thermal resistance than that due to boundary scattering of phonons.
Fisher Timothy S.
Murthy Jayathi Y.
Singh Dhruv
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