DOI: 10.1115/1.4004429. Effect of Phonon Dispersion on Thermal Conduction Across Si/Ge Interfaces

Effect of Phonon Dispersion on Thermal Conduction Across Si/Ge Interfaces

10.1115/1.4004429

Crossref journal-article

ASME International

Journal of Heat Transfer (33)

Abstract

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 nonequilibrium 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.

Bibliography

Singh, D., Murthy, J. Y., & Fisher, T. S. (2011). Effect of Phonon Dispersion on Thermal Conduction Across Si/Ge Interfaces. Journal of Heat Transfer, 133(12).

Authors 3

Dhruv Singh (first)
Jayathi Y. Murthy (additional)
Timothy S. Fisher (additional)

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Dates

Type	When
Created	13 years, 10 months ago (Oct. 5, 2011, 6:30 p.m.)
Deposited	5 years, 10 months ago (Oct. 5, 2019, 4:39 p.m.)
Indexed	1 week, 3 days ago (Aug. 23, 2025, 9:40 p.m.)
Issued	13 years, 10 months ago (Oct. 5, 2011)
Published	13 years, 10 months ago (Oct. 5, 2011)
Published Online	13 years, 10 months ago (Oct. 5, 2011)
Published Print	13 years, 9 months ago (Dec. 1, 2011)

Funders 0

None

BibTeX

@article{Singh_2011, title={Effect of Phonon Dispersion on Thermal Conduction Across Si/Ge Interfaces}, volume={133}, ISSN={1528-8943}, url={http://dx.doi.org/10.1115/1.4004429}, DOI={10.1115/1.4004429}, number={12}, journal={Journal of Heat Transfer}, publisher={ASME International}, author={Singh, Dhruv and Murthy, Jayathi Y. and Fisher, Timothy S.}, year={2011}, month=oct }

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