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.

Caddeo, C., Melis, C., Ronchi, A., Giannetti, C., Ferrini, G., Rurali, R., Colombo, L., Banfi, F., Thermal boundary resistance from transient nanocalorimetry: A multiscale modeling approach, <<PHYSICAL REVIEW. B>>, 2017; 95 (8): N/A-N/A. [doi:10.1103/PhysRevB.95.085306] [http://hdl.handle.net/10807/98318]

Thermal boundary resistance from transient nanocalorimetry: A multiscale modeling approach

Caddeo, Claudia
Primo
;
Ronchi, Andrea;Giannetti, Claudio;Ferrini, Gabriele;Colombo, Luciano
Penultimo
;
Banfi, Francesco
Ultimo
2017

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.
Inglese
Caddeo, C., Melis, C., Ronchi, A., Giannetti, C., Ferrini, G., Rurali, R., Colombo, L., Banfi, F., Thermal boundary resistance from transient nanocalorimetry: A multiscale modeling approach, <<PHYSICAL REVIEW. B>>, 2017; 95 (8): N/A-N/A. [doi:10.1103/PhysRevB.95.085306] [http://hdl.handle.net/10807/98318]
File in questo prodotto:
File Dimensione Formato  
1611.04042.pdf

accesso aperto

Descrizione: arXiv version of the manuscript
Tipologia file ?: Postprint (versione finale dell’autore successiva alla peer-review)
Licenza: Creative commons
Dimensione 3.76 MB
Formato Adobe PDF
3.76 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10807/98318
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 18
  • ???jsp.display-item.citation.isi??? 16
social impact