Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 68: Focussed session: Functional molecules at surfaces III
O 68.4: Vortrag
Donnerstag, 29. März 2012, 12:00–12:15, A 053
Electronic and structural properties of azobenzene adsorbed on layered materials — •Eric Ludwig1, Torben Johannsen1, Michael Naboka2, Thomas Strunskus3, Alexei Nefedov2, Christof Wöll2, Lutz Kipp1, and Kai Rossnagel1 — 1Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098 Kiel — 2Institut für Funktionelle Grenzflächen, Karlsruher Institut für Technologie, D-76344 Eggenstein-Leopoldshafen — 3Institut für Materialwissenschaft, Universität Kiel, D-24098 Kiel
Molecular switches with optically tunable properties are often ascribed a high potential in the field of molecular electronics.
However, one of the main challenges has not yet been solved, namely to attach a large number of molecules to a solid surface in a way that
efficient switching remains possible.
Here, we present a combined direct and inverse photoelectron spectroscopy and NEXAFS study of azobenzene adsorbed on
layered transition metal dichalcogenides. Specifically, we have used a metallic and a semiconducting substrate to determine the influence of the substrate electronic structure
and a novel sublimation setup to deposit azobenzene non-destructively from sub-monolayer to multilayer
coverages.
Our results indicate generally weak substrate-adsorbate interactions, which is reflected, for instance,
in Vomer-Weber growth on the semiconducting substrate and almost flat-lying molecules for monolayer coverage.
The photoemission and NEXAFS data also show evidence for photoswitching of multilayers on both substrates.
This work was supported by the DFG through SFB 677.