Dresden 2011 – scientific programme
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O: Fachverband Oberflächenphysik
O 59: Poster Session III (Nanotribology; Polymeric biomolecular films; Organic electronics and photovoltaics, Covalent networks on surfaces; Phase transitions; Particles and clusters; Transparent conductive oxides)
O 59.8: Poster
Wednesday, March 16, 2011, 17:30–21:00, P3
Azobenzene thin film growth on surfaces of layered materials — Eric Ludwig1, •Torben Johannsen1, Thomas Strunskus2, Alexei Nefedov3, Christof Wöll3, Lutz Kipp1, and Kai Rossnagel1 — 1Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098 Kiel — 2Institut für Materialwissenschaft, Universität Kiel, D-24098 Kiel — 3Institut für Funktionelle Grenzflächen, Karlsruher Institut für Technologie, D-76344 Eggenstein-Leopoldshafen
NEXAFS and ultraviolet photoelectron spectroscopy have been used to determine the layer growth and structural properties of azobenzene adsorbed on layered compounds. We used metallic TiTe2 and semiconducting HfS2 as substrates to elucidate the influence of different electronic structures. Due to weak van der Waals-like coupling between the layers both materials serve as excellent substrates for the analysis of adsorbed photoswitches and their possible switching behavior. NEXAFS measurements were performed at BESSY (beamline HE-SGM). UPS measurements were done with a He gas-discharge lamp (hν = 21.22 eV) and a hemisperical photoelectron analyzer.
Results indicate different growth modes on semiconducting and metallic substrates. Partial reversible photoswitching of the multilayer system was observed on the semiconducting substrate. On the metallic substrate no switching was observed, presumably due to stronger absorbate-substrate interactions. This work was supported by the DFG through SFB 677.