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DS: Fachverband Dünne Schichten

DS 28: Poster: Thin Film Properties: Structure, Morphology and Composition

DS 28.5: Poster

Mittwoch, 18. März 2020, 15:00–18:00, P1A

2D Extended crystalline films for organic electronics applications — •Fabian Streller, Tim Hawly, and Rainer Fink — Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg

Excelling in applications where large area coverage, low cost and flexibility are limiting factors of device fabrication, organic semiconductors are of high interest as alternative functional layers in modern electronic devices. While well-established preparation methods for organic thin films such as physical vapor deposition (PVD) offer good process control via parameters, such as deposition rate, they suffer from intrinsic limitations, namely the formation of polycrystalline layers, leading to charge trapping at grain boundaries and hence, reduced charge carrier mobilities. Herein, we report on the formation of highly oriented, long range-ordered thin films created in a novel approach via surfactant assisted self-assembly at the liquid-liquid interface.[1] Thin films with thicknesses of only few monolayers crystallized out of solution, utilizing a surfactant-modified water surface as a substrate. Thus prepared film were characterized by microscopic (AFM, SAED) and spectroscopic (NEXAFS, STXM) methods. To further investigate their suitability in organic electronics (OFETs, OLEDs), charge transfer characteristics were measured, exceeding those of reference devices by at least an order of magnitude.

[1] Q. Wang, F. Yang, Y. Zhang, M. Chen, X. Zhang, S. Lei, R. Li, W. Hu J Am Chem Soc. 2018, 140, 5339-5342