Cross-plane thermal transport measurements across CVD grown few layer graphene films on a silicon substrate

Baojie Lu, Longhan Zhang, Oluwaseyi Balogun*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Room-temperature time-domain thermoreflectance technique (TDTR) measurements of cross-plane heat conduction across gold-graphene-silicon interfaces are presented. The graphene layers are originally grown on a copper substrate by chemical vapor deposition and later transferred to a silicon substrate in layer-by-layer fashion. We estimate the thermal boundary conductance (TBC) as a function of number of graphene layers, by fitting a layered heat conduction model that accounts for heat accumulation in the gold layer to the TDTR data, using the TBC as a free fitting parameter. The estimated TBC was found to decrease with number of graphene layers at the interface, as observed in previous TDTR measurements reported in the literature. The decrease in TBC with number of graphene layers matches the trends in the transmission coefficient of low frequency (25 GHz) coherent acoustic phonons across the interface, indicating that the interface elastic stiffness decreases with the number of graphene layers due to poor bonding between the gold film and silicon substrate.

Original languageEnglish (US)
Article number045126
JournalAIP Advances
Volume9
Issue number4
DOIs
StatePublished - Apr 1 2019

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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