Graphene doping as a function of copper substrate separation: a first-principles
study
Peter Brommer, Alexander Marsden, Gavin Bell, Neil Wilson, David Quigley
University of Warwick, Coventry CV4 7AL, UK
The changes of the band structure of graphene grown by chemical vapour
deposition (CVD) on copper foil can be measured using angle-resolved
photoemission spectroscopy (ARPES). To isolate the effects caused by
electronic coupling between graphene and substrate, we use density
functional theory studies of the effective band structure in various
graphene-on-Cu epitaxial systems. We found that the amount of n-doping
is a sensitive function of the graphene-substrate separation. For
Cu(100), n-doping is minimal. These insights enhance our understanding
of the presence of the substrate in ARPES band structure measurements
and thus allow a meaningful interpretation of the experimental
characterization.