Dresden 2020 – scientific programme
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DS: Fachverband Dünne Schichten
DS 46: Thin Film Properties: Structure, Morphology and Composition IV
DS 46.4: Talk
Friday, March 20, 2020, 12:00–12:15, CHE 89
Solution-based thin films of bridged triarylamines: Unravelling the self-assembly — •Tim Hawly1, Fabian Streller1, Manuel Johnson1, Sandra Míguez-Lago1, Milan Kivala2, and Rainer Fink1 — 1Department Chemie und Pharmazie, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany — 2Centre of Advanced Materials, Universität Heidelberg, Germany
Columnar (1D) triarylamine thin films from a dip-coating approach have been discussed in literature as potential candidates for functional n-type semiconducting layers and regarding both their solution processability and crystal structure. Herein, we report on the growth behavior and realization of upstanding 2D-extended films of a series of bridged triarylamines via a solution-based processing method.
Film preparation is inspected at different length scales by optical microscopy (OM) and atomic force microscopy (AFM). Long-range order, crystallinity and layer thickness appeared to decisively depend on the nature of the peripheral substituents attached to the polycyclic aromatic backbone with flat core structures being preferred over non-planar ones. Electron diffraction (SAED) confirmed the crystalline structure of the obtained ultrathin films. Additionally, first steps to clarify the molecular orientation within prepared structures were taken via angle-resolved near edge x-ray absorption fine structure (NEXAFS) spectroscopy. Our work presents a fine tool ensemble for unambiguous design and structure elucidation of high-quality, 2D heterotriangulene systems aiming at potential application fields such as layered organic electronics. This research is funded by the DFG within GRK1896.