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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.36: Poster

Wednesday, March 16, 2011, 17:30–21:00, P4

PTCDA monolayer growth on epitaxial graphene — •Matthias Meißner, Bernd Schröter, and Torsten Fritz — Institute of Solid State Physics, University of Jena, 07743 Jena, Germany

As a model system for organic epitaxy on graphene we have investigated the epitaxy of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) on epitaxial graphene (EG) with Low Energy Electron Diffraction (LEED), Angle-Resolved Ultraviolet Photoelectron Spectroscopy (ARUPS) and Scanning Tunneling Microscopy (STM). Graphene was grown by thermal decomposition of 6H-SiC(0001) in an argon atmosphere at ambient pressure [1]. For a PTCDA monolayer on EG, a new point-on-line phase has been discovered, beside that phase known already from the epitaxy of PTCDA on graphite(0001) [2]. ARUPS measurements coincide well with theoretical and experimental UPS data on thick PTCDA films [3] and show additionally a complete lack of dispersion in the PTCDA bands within experimental accuracy, confirming a weak intermolecular overlap of wave functions.

[1] K. V. Emtsev et al., Nature Materials 8, 203 (2009).

[2] C. Ludwig et al., Physik B Condensed Matter 86, 397 (1992).

[3] I. G. Hill et al., Chemical Physics Letters 317, 444 (2000).