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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: Poster III
CPP 28.17: Poster
Wednesday, March 20, 2024, 11:30–13:30, Poster C
Investigation of structural order at the BF-DPB:BPYMPM donor-acceptor interface by scanning tunneling microscopy — •Milena Merkel1,2, Philipp Wiesener1,2, Koen Vandewal3, and Harry Mönig1,2 — 1Physikalisches Institut, Universität Münster, Wilhelm-Klemm-Strasse 10, Münster 48149, Germany — 2Center for Nanotechnology (CeNTech), Heisenbergstrasse 11, Münster 48149, Germany — 3Institute for Materials Research (IMO-IMOMEC), Hasselt University, Wetenschapspark 1, 3590 Diepenbeek, Belgium
The two molecules B2PYMPM and B4PYMPM serve as electron acceptors in both organic light-emitting diodes and organic solar cells. They differ only in the position of the nitrogen atoms in their lateral pyridine rings, which however leads to the formation of intermolecular hydrogen bonds and subsequent molecular stacking only in the case of B4PYMPM [1]. Paired with the electron donor BF-DPB, the increased structural order of the B4PYMPM molecules results in highly efficient free charge carrier generation [2].
To understand the differences in charge carrier dissociation between the two acceptors, we used a combined approach of scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). Our STM data with intramolecular resolution comparatively provide insights into the nano-scale self-assembly and inherent intermolecular interactions, which are correlated with XPS core level spectra.
[1] Yokoyama et al., Adv. Funct. Mater., 21, 1375-1382 (2011)
[2] Ullbrich et al., Nat. Mater., 18, 459-464 (2019)