Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Graphene II
O 27.9: Vortrag
Dienstag, 27. März 2012, 12:30–12:45, MA 041
Electronic Structure of a Copper Phthalocyanine Monolayer on Graphene/Ru(0001) — •T Nguyen1, M Scholz1, A Schoell1,2, M Mulazzi1, D Ehm3, and F Reinert1,2 — 1Experimentelle Physik VII und Wilhelm Conrad Röntgen Research Center for Complex Material Systems (RCCM), Universität Würzburg, D-97074 Würzburg — 2Gemeinschaftslabor für Nanoanalytik, Karlsruher Institut für Technologie KIT, D-76021 Karlsruhe — 3Carl Zeiss SMT AG, Rudolf-Eber-Str. 2, 73447 Oberkochen,
We have studied the electronic structure of single layers of copper phthalocyanine (CuPc) on graphene/Ru(0001). The CuPc monolayers were prepared on graphene/Ru(0001) by using organic molecular beam deposition (OMBD). The surface structure of CuPc was characterized by low energy electron diffraction (LEED) and angle-resolved photoemission spectroscopy (ARPES) was used to investigate the electronic structure and the interaction of the molercules with the substrate. We show that there is a strong coupling between the CuPc molecule and the gaphene/Ru(0001) surface. This is reflected by the ARPES data that shows a HOMO peak at a binding energy of 2.1 eV and an additional signal near the Fermi edge at about 0.8 eV. This can be assigned to the former LUMO (F-LUMO) state [1] which is (partly) occupied due to a charge transfer from the graphen/Ru(0001) surface and the CuPc [2].
Reference.
1. Zou, Y., et al., Surface Science, 2006. 600(6): p. 1240-1251.
2. Stadtmuller, B., et al., Physical Review B, 2011. 83(8).