Regensburg 2010 – scientific programme
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.85: Poster
Wednesday, March 24, 2010, 17:45–20:30, Poster B1
Binding chemistry and interface dipole formation of dithiol-based monolayers on gold — •Philip Schulz1,2, Christopher D Zangmeister2, Dominik Meyer1, Matthias Wuttig1, and Roger D Van Zee2 — 1Institute of physics (IA), RWTH Aachen University of Technology, 52062, Aachen, Germany — 2Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
The conditioning of metal surfaces via self-assembled monolayers (SAM) of molecules anchored by a sulfur endgroup is a widely studied issue in the field of organic electronics. In particular the electronic properties of the interface between electrode and subsequent functional organic layer in organic light emitting diodes (OLED), thin film transistors (OTFT) and photovoltaic devices (OPV) can be altered in order to promote charge transfer and improve the overall device efficiency. In our study we investigated the growth and electronic structure of dithiol-based monolayers on a Au(111) surface. We focus on the influence of this linker chemistry on the energy level alignment of the SAM and the workfunction change of the gold substrate. FTIR measurements were employed to verify the film formation while the electronic structure was further investigated by photoelectron spectroscopy. Not only did we derive the coverage and film perfection from XPS measurements but could also show a distinct charge rearrangement in the molecular layer while UPS measurements revealed a considerable lowering of the workfunction. DFT calculations have been employed in order to describe these phenomena.