Abstract
A Full Band Monte Carlo simulator has been developed to consider phonon transmission across interfaces disposed perpendicularly to the heat flux. This solver of the Boltzmann transport equation does not require any assumption on the shape the phonon distribution and can naturally consider all phonon transport regimes from the diffusive to the fully ballistic regime. This simulator is used to study single and double Si/Ge heterostructures from the micrometer scale down to the nanometer scale, i.e. in all phonon transport regime from fully diffusive to ballistic. A methodology to determine the thermal conductivity at thermal interfaces is presented. It is also shown that the different transport regimes are correlated to different spectral contributions of the phonon modes to the heat flux along the devices. This local indicator of the transport regime gives new insights into the out-of-equilibrium phonon transport near the interfaces.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
This work was supported by a public Grant overseen by the French National Research Agency (ANR) as part of the “Investissements d’Avenir” program (Labex NanoSaclay, reference: ANR-10-LABX-0035).
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Le, N.D., Davier, B., Izitounene, N. et al. Study of phonon transport across Si/Ge interfaces using Full-Band phonon Monte Carlo simulation. J Comput Electron 21, 744–755 (2022). https://doi.org/10.1007/s10825-022-01885-x
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DOI: https://doi.org/10.1007/s10825-022-01885-x