Dresden 2011 – wissenschaftliches Programm

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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

Mittwoch, 16. März 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.