SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster Session I

CPP 17.52: Poster

Monday, March 27, 2023, 18:00–20:00, P3

Bilayer formation in liquid-processed mono-functionalized BTBT films — Tim Hawly, •Andreas Späth, Manuel Johnson, Marcus Halik, Mingjian Wu, Erdmann Spiecker, and Rainer H. Fink — FAU Erlangen-Nürnberg, Erlangen, Germany

Two-dimensionally (2D) extended thin films of the p-type organic semiconductor C13-BTBT were fabricated by self-controlled growth at the water-toluene interface. Depicting a compound class originally developed for further functionalization and subsequent realization of self-assembled monolayers (SAMs) or their implementation into SAM-based organic field-effect transistors, the potent BTBT core unit commonly excels in high-quality structure formation as well as charge-transport characteristics. Utilizing various spectromicroscopic tools, we observe extraordinarily crystalline C13-BTBT films with a close to upright standing configuration of the BTBT backbone accounting for superior intermolecular orbital overlap. The well-defined morphology and internal structure of the film are underpinned by superior charge-transport parameters in corresponding OFETs. The inherently favorable membrane-like bilayer molecular arrangement is confirmed by the unambiguous representation of the unit cell as derived from STEM tomography. This study has been funded by the DFG within GRK 1896, the BMBF (contract 05K19WE2) and the Bavarian SolTECH initiative. [1] T. Hawly et al., ACS Adv. Energy Mat.(2022)/doi:10.1021/acsaelm.2c01095