Wang, Yi-LinRen, JunSong, Can-LiJiang, Ye-PingWang, Li-LiHe, KeChen, XiJia, Jin-FengMeng, ShengKaxiras, EfthimiosXue, Qi-KunMa, Xu-Cun2011-12-162011-12-162011-12-16201010.1103/PhysRevB.82.245420https://infoscience.epfl.ch/handle/20.500.14299/74803WOS:000286896600008We investigate the electronic coupling between copper hexadecafluoro-phthalocyanine (F16CuPc) and epitaxial graphene (EG) on 6H-SiC (0001) using a combined approach of low-temperature scanning tunneling spectroscopy and electronic structure calculations. The molecules are preferentially adsorbed on monolayer EG than bilayer EG. Competing molecule-surface and intermolecular van der Waals interactions result in two well-ordered incommensurate phases. We show that the amount of charge transfer from EG to F16CuPc can be tuned by applied voltage or the thickness of graphene layers. A characteristic feature at similar to 0.4 eV above the Dirac point is identified in bilayer EG, which indicates its electronic structure is modified via introducing extra unoccupied states upon adsorption.Scanning-Tunneling-MicroscopyBilayer GrapheneThin-FilmsScatteringSubstrateGraphitetext::journal::journal article::research article