Berlin 2018 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Poster Session IV

CPP 46.55: Poster

Wednesday, March 14, 2018, 11:00–13:00, Poster A

Optical and structural properties of diindenoperylene and perylene-tetracarboxylic-diimide on ZnO and SiO₂ — •Clemens Zeiser, Alexander Hinderhofer, Alexander Gerlach, and Frank Schreiber — Institut für Angewandte Physik, Universität Tübingen, Germany

In recent years, heterostructures of donor and acceptor compounds have attracted significant attention due to their applications in organic devices [1]. We studied blends of diindenoperylene and perylene-tetracarboxylic-diimide (PTCDI) deposited by organic molecular beam deposition on SiO₂ as an inert and on ZnO as a strongly interactive substrate. Uniaxial absorption spectra of films on silicon oxide measured by spectroscopic ellipsometry could be explained with the molecular structure determined by synchrotron x-ray diffraction. Using differential reflectance spectroscopy, also thickness dependent absorption spectra of films deposited on ZnO and SiO₂ have been examined. We find changes in the vibronic progression of flat-lying monolayer spectra which could be assigned to molecular interactions with the ZnO surface [2]. Furthermore, also the changing absorption spectra of the following layers could be explained by molecular coupling and morphologic influences.

[1] A. Hinderhofer, ChemPhysChem 2012, 13, 628-643

[2] P. Winget et. al., Adv. Mater. 2014, 26, 4711-4716