Regensburg 2010 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,

DS 29.52: Poster

Mittwoch, 24. März 2010, 15:00–17:30, Poster A

Investigation of the chemical and electronic structure of CoPc from sub-monolayer to thick films by photoemission spectroscopy — •Uwe Treske, Feng Zhu, Mandy Grobosch, and Martin Knupfer — IFW Dresden

We have grown highly oriented films of cobalt(II) phthalocyanine (CoPc) under ultra high vacuum conditions on single crystalline Au(001)-5x20 surfaces. The molecular orientation and ordering have been studied by low energy electron diffraction (LEED). LEED patterns taken for sub-monolayer up to several nm thick CoPc films reveal highly ordered CoPc films. Within the films the molecules lie with their molecular axis parallel to the Au(001)-5x20 surface. By means of combined X-ray and ultraviolet photoemission spectroscopy (XPS, UPS) we have investigated the chemical and electronic structure of the CoPc films for all thicknesses. Our results indicate a clear difference in the valence band spectra for sub-monolayer and several nm thick CoPc films due to a possible influence of image charge screening effects on the molecular orbitals in the vicinity of the Fermi level.