Phonon dominated heat conduction normal to Mo/Si multilayers with period below 10 nm

Nano Letters
Zijian LiKenneth E Goodson

Abstract

Thermal conduction in periodic multilayer composites can be strongly influenced by nonequilibrium electron-phonon scattering for periods shorter than the relevant free paths. Here we argue that two additional mechanisms-quasiballistic phonon transport normal to the metal film and inelastic electron-interface scattering-can also impact conduction in metal/dielectric multilayers with a period below 10 nm. Measurements use the 3ω method with six different bridge widths down to 50 nm to extract the in- and cross-plane effective conductivities of Mo/Si (2.8 nm/4.1 nm) multilayers, yielding 15.4 and 1.2 W/mK, respectively. The cross-plane thermal resistance is lower than can be predicted considering volume and interface scattering but is consistent with a new model built around a film-normal length scale for phonon-electron energy conversion in the metal. We introduce a criterion for the transition from electron to phonon dominated heat conduction in metal films bounded by dielectrics.

References

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Citations

Nov 27, 2014·Journal of Physics. Condensed Matter : an Institute of Physics Journal·J LombardS Merabia
Nov 8, 2020·Materials·Francisco Alfredo García-PastorJaime Alvarez-Quintana
Apr 7, 2021·The Review of Scientific Instruments·Shingi YamaguchiJunichiro Shiomi
Jul 29, 2021·ACS Applied Materials & Interfaces·Nazar FaridGerard M O'Connor

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