Berlin 2008 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 18: Poster: Towards Molecular Spintronics, Organic Thin Films, Optical Layers, Vibrational Spectroscopy, Tayloring organic interfaces

DS 18.20: Poster

Dienstag, 26. Februar 2008, 14:30–19:30, Poster A

LT-STM study of indivdual CuPc molecules on Cu(111) — Hatice Karacuban, •Johannes Schaffert, Sascha Koch, Thorsten Wagner, and Rolf Möller — Universität Duisburg-Essen, Fachbereich Physik, Lotharstr. 1-20, 47057 Duisburg

The interface between organic semiconductors and metals plays a key role for the electronic properties and thus for their application in devices. We present a low temperature scanning tunneling microscopy and spectroscopy study of copper phthalocyanine on Cu(111). A submonolayer of CuPc was evaporated onto a clean Cu(111) single crystal at room temperature under ultra high vacuum (UHV) conditions. Previous measurements show that at room temprature single CuPc molecules are mobile on the Cu(111) surface and can not be imaged by means of STM. The presented STM measurements have been carried in UHV at temperatures below 10K. We observe CuPc adsorbed in two different geometries, as well as the equivalent sites, rotated by multiples of 60°. One of the adsorption sites leads to an apparent reduction of the molecules four-fold symmetry in the STM image. Two opposite of four benzopyrrol rings appear brighter. First spectroscopic results show, that the brighter parts also differ electronically. Furthermore, the molecules adsorbed with reduced symmetry tend to align forming chains of molecules on the Cu(111)surface.