Berlin 2018 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 7: Microstructure of thin films / TEM-based Nanoanalysis

KFM 7.2: Talk

Monday, March 12, 2018, 15:20–15:40, E 124

Self-assembly of organic semiconducting material at the liquid-liquid interface — •Manuel Johnson, Tim Hawly, and Rainer H. Fink — Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058, Erlangen, Germany

Charge transport in organic electronic devices like organic field-effect transistors (OFETs) crucially depends on the structural properties of the active organic layer [1].For their successful preparation homogenous and highly ordered thin films of semiconductor material are required. Since vacuum sublimation induces polycrystalline film growth and therefore limits the performance of thus prepared devices, different solution based techniques have been developed for the fabrication of long-range ordered and single-crystalline organic thin films [2]. We tested a preparation technique where we utilize the self-organization of molecules with sufficiently strong ππ-interaction at the liquid-liquid interface and discuss the influence of different preparation parameters. The liquid surrounding offers better chance for molecular diffusion and self-organization and consequently the near-equilibrium growth of crystalline organic films with lateral extensions in the range of several 100um. First microspectroscopic results already confirm the long range order and crystallinity inside the organic thin films.

[1] M. Halik et al, Adv. Mat. 2003, 15

[2] C. Xu, et al., Angewandte Chemie (Intern. Ed.) 55, (2016)