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O: Fachverband Oberflächenphysik
O 10: Metal substrates: Adsorption of organic / bio molecules II
O 10.2: Talk
Monday, March 14, 2011, 15:15–15:30, TRE Phy
Low Temperature Scanning Tunneling Microscopy Study of Co-Phthalocyanine Molecules on Au (111) and Cu (111) — •Samuel Bouvron1, Philipp Erler1, Stefan Ambrus2, Mikhail Fonin1, Frank Matthes3, and Claus Michael Schneider3 — 1Fachbereich Physik, Universität Konstanz — 2Fachbereich Chemie, Universität Konstanz — 3Institut für Festkörperforschung, Forschungzentrum Jülich
Metal-phthalocyanines are complexes of great technological and fundamental interest which are already extensively used as pigments and are possible candidats for future applications in molecular electronic devices. For a better understanding of the interaction between metal-phthalocyanines and surfaces, we investigated Co-phthalocyanine molecules (CoPc) on Au (111) and Cu (111) at a submonolayer coverage by means of low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS). The adsorption behavior of CoPc on both substrates is studied, and a direct observation of the molecular orbitals is reported. STS measurements performed above the CoPc molecules on Cu (111) show a reproducible feature directly below EF, whose origin is discussed. Furthermore the impact of an external magnetic field (up to 6 T) on the electronic density of states close to EF is studied.