Berlin 2008 – wissenschaftliches Programm
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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications
SYSA 5: Poster Session SYSA
SYSA 5.79: Poster
Dienstag, 26. Februar 2008, 14:30–20:00, Poster A
Exploring the binding of the strong organic acceptor F4TCNQ to coinage metals — •Gerold Rangger1, Lorenz Romaner1, Georg Heimel2, Steffen Duhm3, Ralf-Peter Blum3, Benjamin Bröker3, Norbert Koch3, Alexander Gerlach4, Frank Schreiber4, and Egbert Zojer1 — 1Institut für Festkörperphysik, Technische Universität Graz, 8010 Graz, Austria. — 2Department of Material Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02143, USA — 3Institut für Physik, Humboldt-Universität zu Berlin, 12389 Berlin, Germany — 4Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
Organic/metal interface properties are of high interest for the application of molecular (sub)monolayers to modify surface properties. They are applied for, e.g., molecular electronics, chemical sensing, or the tuning of injection barriers in organic electronic devices.
We present a joint theoretical and experimental study of F4TCNQ adsorbed on Cu(111). The electronic and structural properties were determined by ultraviolet photoelectron spectroscopy (UPS) and X-ray standing wave (XSW) measurements. To better understand the complex process of binding, we modelled the system using density-functional theory. We find forward-donation from the lone pairs of the molecule into metallic states and back-donation from the metal into the LUMO of the molecule. The data on Cu(111) are compared to F4TCNQ on Au(111) and Ag(111) as well as to investigations of pyrenetetraone on various coinage metals.