Dresden 2017 – scientific programme

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DS: Fachverband Dünne Schichten

DS 29: Organic Thin Films I

DS 29.12: Talk

Wednesday, March 22, 2017, 12:30–12:45, CHE 91

Structural Properties of Thin Films of Phenacenes — •Jan Hagenlocher¹, Alexander Hinderhofer¹, Kera Satoshi², and Frank Schreiber¹ — ¹Eberhard Karls Universität, Tübingen — ²Institute for Molecular Science, Okazaki, Japan

We studied the structural properties of the high band gap organic semiconductors Picene, [6]Phenacene and [7]Phenacene which exhibit high conductivity. X-ray reflectivity, grazing incidence X-ray diffraction and atomic force microscopy were applied to study the influence of a small length difference between the molecules on the crystallographic structure and morphology of the resulting mixed thin film. The compounds employed are well suited since they consist of different numbers of benzene rings fused together in a zig-zag pattern and differ only in length. It was found that the crystallographic structure remains unchanged upon mixing but the wetting behaviour, the morphology and especially the films roughness changes significantly. Different explanations are discussed and further explored using real-time X-ray reflectivity and analysis of terrace coverage of individual islands. Additionally, the optical properties of the thin films were investigated with UV-Vis spectroscopy.