SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 37: Poster: Ultrafast Electron Dynamics at Surface and Interfaces II

O 37.1: Poster

Dienstag, 28. März 2023, 18:00–20:00, P2/EG

Probing alternative pathways for electron transfer across a monomolecular film — Saunak Das¹, Zhiyong Zhao¹, Takanori Fukushima², Andreas Terfort³, and •Michael Zharnikov¹ — ¹Angewandte Physikalische Chemie, Universität Heidelberg, 69120 Heidelberg, Germany — ²Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan — ³Institut für Anorganische und Analytische Chemie, Johann Wolfgang-Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany

Charge transport (CT) across a two-dimensional molecular assembly can involve alternative pathways. Using specifically designed monomolecular films we probe (i) competition of intramolecular and intermolecular pathways in a molecular assembly and (ii) competition of different intramolecular pathways within a single molecule. For this purpose, we apply so-called core-hole-clock approach in the framework of resonant Auger electron spectroscopy, allowing the measurement of the characteristic CT time from the terminal tail group of the assembled molecules to the substrate. We show that the intramolecular CT is generally preferable and so-called matrix effects play a negligible role for CT, strongly favoring the through-bond CT model. In the case of availability of several alternative pathways within an individual molecule, a pathway with the highest conductance becomes highly dominant, while other pathways contribute minorly to the entire CT.