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O: Fachverband Oberflächenphysik
O 43: Inorganic/Organic Interfaces: Electronic Properties I
O 43.10: Vortrag
Mittwoch, 18. März 2015, 13:00–13:15, MA 005
Excitation processes in Copper-porphyrin aggregates studied by multi-photon Photoemission Electron Microscopy (PEEM) — •Hannes Hartmann1, Ingo Barke1, Mohammadreza Bahrami1, Lukas Rathje1, Tamam Bohammud1, Per-Arno Plötz1, J.A.A.W Elemans2, Oliver Kühn1, Karl-Heinz Meiwes-Broer1, and Sylvia Speller1 — 1Institute of Physics, University of Rostock, Germany — 2Institute of Molecules and Materials, Radboud University Nijmegen, Netherlands
Hybrid systems composed of nanoparticles and molecular aggregates are subject to intense research due to potential applications in organic electronics and for photovoltaics. We are interested in the role of the local environment on the various types of excitations in such systems and in their transport. Copper-porphyrin aggregates are prepared on Si(111) covered by native oxide and on highly ordered pyrolytic graphite (HOPG) by self-organized growth. Multi-photon excitation with a tunable fs-laser system leads to emission of photoelectrons that are analyzed in a Photoemission Electron Microscopy (PEEM). Beside the electronic structure, correlative mapping including scanning probe microscopy (AFM) at the same location can help to identify contributing processes and to elaborate the role of structural features and transport properties on the emission intensity and energy.