Thermal boundary resistance from transient nanocalorimetry: A multiscale modeling approach

Claudio Giannetti, Gabriele Ferrini, Francesco Banfi, Claudia Caddeo, Andrea Ronchi, Luciano Colombo, Claudio Melis, Riccardo Rurali

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

14 Citazioni (Scopus)

Abstract

The thermal boundary resistance at the interface between a nanosized Al film and an Al2O3 substrate is investigated at an atomistic level. The thermal dynamics occurring in time-resolved thermoreflectance experiments is then modeled via macrophysics equations upon insertion of the materials parameters obtained from atomistic simulations. Electrons and phonons nonequilibrium and spatiotemporal temperatures inhomogeneities are found to persist up to the nanosecond time scale. These results question the validity of the commonly adopted lumped thermal capacitance model in interpreting transient nanocalorimetry experiments. The strategy adopted in the literature to extract the thermal boundary resistance from transient reflectivity traces is revised in the light of the present findings. The results are of relevance beyond the specific system, the physical picture being general and readily extendable to other heterojunctions.
Lingua originaleEnglish
pagine (da-a)N/A-N/A
Numero di pagine12
RivistaPHYSICAL REVIEW. B
Volume95
DOI
Stato di pubblicazionePubblicato - 2017

Keywords

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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