Berlin 2024 – scientific programme
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DS: Fachverband Dünne Schichten
DS 6: Thin Film Properties I
DS 6.9: Talk
Tuesday, March 19, 2024, 12:15–12:30, A 060
Spiral and pyramid like structures in solvent prepared crystalline organic C13-BTBT thin films — •Fabian Streller1, Manuel Johnson1, Mingjian Wu2, Erdmann Spiecker2, and Rainer Fink1 — 1Friedrich Alexander Universität Erlangen Nürnberg (FAU), Department Chemistry & Pharmacy — 2Friedrich Alexander Universität Erlangen Nürnberg (FAU), Department Materials Science und Engineering
The demand for high quality organic thin films for electronic applications is steadily increasing. In OLEDs, OFETs, or sensorics devices, their light weight, flexibility, chemical tunability, and large area preparation makes organic semiconductors valuable resources. Saturated solutions of many aromatic molecules may lead to the formation of large-area crystalline 2D organic film at the solvent-water interface driven by the π-π-interactions for molecular self-organization. In rare cases we observe spiral and pyramidal structures. Excitingly, 3D structures in solvent prepared α-,ω-Hex-6T-Hex show uniform azimuthal rotations in subsequent layers. Here we extend these studies onto mono-substituted C13-BTBT. The interaction towards the water and thus the ratio of intra- vs. interlayer interactions was modified by water surfactants. Compared to previous results, the 3D structures are more extended. Complementary microscopic (AFM, KPFM, TEM, 4D-SCEM) and spectroscopic probes were applied to gain further insight into structure-property relationships and the origin of specific 3D structures. The research is funded by the BMBF (contract 05K22WE2).
Keywords: thiophene; thin film; fabrication