Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 28: Organic-Inorganic Systems I: PTCDA
O 28.6: Vortrag
Dienstag, 8. März 2016, 12:00–12:15, S054
Tracing structural and electronic changes in the first metal layer of metal-organic hybrid interfaces — •Johannes Seidel1, Norman Haag1, Lisa Grad1, Gerben van Straaten3, Markus Franke3, Christian Tusche2, Jürgen Kirschner2, Christian Kumpf3, Benjamin Stadtmüller1, Mirko Cinchetti1, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Strasse 46, 67663 Kaiserslautern, Germany — 2Max-Planck-Institut für Mikrostrukturphysik, 06120 Halle, Germany — 3Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany
In this work, we show how the geometric and electronic properties of metal surfaces can be altered by the molecule-substrate interaction. As a model system, we chose a Ag(111) surface and embed Pb tracer atoms into the topmost Ag(111)-layer by surface alloying.
We have studied the electronic valence structure of interfaces formed by prototypical organic molecules adsorbed on the Pb/Ag(111) surface alloy by momentum microscopy. While the adsorption of PTCDA significantly alters the alloy band structure, no changes are observed for CuPc. The changes in the valence band of the PTCDA/Pb/Ag(111) interface can be explained by vertical relaxation of the Pb tracer atoms as determined by x-ray standing waves method. Such relaxation occurs only at the interface formed with PTCDA, not with CuPc. We thus propose that the modifications of the Pb/Ag(111) surface alloy can be attributed to the formation of local bonds between PTCDA and the surface alloy which are absent in case of CuPc.