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O: Fachverband Oberflächenphysik
O 6: Organic/bio Molecules on Metal Surfaces I
O 6.3: Talk
Monday, March 11, 2013, 11:00–11:15, H38
Electronic coupling in hetero-organic structures on Ag(111) — •Benjamin Stadtmüller1,2, Martin Willenbockel1,2, Daniel Lüftner3, Eva M. Reinisch3, Christoph Schmitz1,2, Sergey Soubatch1,2, Michael G. Ramsey3, Peter Puschnig3, F. Stefan Tautz1,2, and Christian Kumpf1,2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Jülich Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology — 3Institut für Physik, Karl Franzens-Universität Graz, 8010 Graz, Austria
The performance of organic materials in electronic devices depends on the ability to control the properties at the interfaces between different active layers. While almost all studies up to now focused on organic layers containing only one molecular species, some groups have recently started to investigate hetero-organic films with two different types of molecules. We have chosen mixed monolayer structures of CuPc and PTCDA adsorbed on Ag(111) as a model system. Our structural data revealed different long range ordered structures depending on the relative coverage of CuPc to PTCDA. The influence of intermolecular interactions on the electronic structure was studied by angle resolved photoelectron spectroscopy (ARPES). Analyzing the ARPES data in the orbital tomography approach [1] indicated a significant change in the occupation of the molecular orbitals in the mixed films. These modifications are correlated to the formation of an interface state expanding over both molecular species which leads to a coupling of the molecular valence states. [1] P. Puschnig et al, PRB 84, 235427 (2011)