Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 75: Metal substrates: Adsorption of organic / bio molecules VIII
O 75.7: Vortrag
Donnerstag, 17. März 2011, 16:30–16:45, PHY C213
Molecular switching analyzed with sub-molecular precision: CuPc on Cu(111) — •Johannes Schaffert1, Maren Cottin1, Andreas Sonntag1, Hatice Karacuban1, Nicolás Lorente2, Christian Bobisch1, and Rolf Möller1 — 1Faculty of Physics, Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, 47048 Duisburg, Germany — 2Centro de Investigación en Nanociencia y Nanotecnología, Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
The current fluctuations in Scanning Tunneling Microscopy and Spectroscopy have been analyzed in real time using special analogue electronics. This type of Scanning Action Microscopy technique allows to map topography and switching processes simultaneously. For the Cu-Phthalocyanine (CuPc) molecule on Cu(111), switching between two states is observed. The switching frequency, the switching amplitude and the ratio between the residence times in the observed states can be studied with Angstrom spacial resolution. Spectroscopic data obtained at 7K yields information about the involved electronic states. Based on the experimental data as well as DFT calculations a model will be presented. The CuPc molecule switches between different adsorption configurations, which are attributed to different angles of molecular rotation on the Cu(111) surface.