Berlin 2024 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 17: Organic Thin Films, Organic-Inorganic Interfaces

DS 17.4: Vortrag

Donnerstag, 21. März 2024, 15:45–16:00, A 060

Influence of Electrostatic Forces: Molecular Packing in 2D and 3D Films — •Jan Vincent Schreiber, Maximilian Dreher, and Gregor Witte — Philipps-Universität Marburg, Molekulare Festkörperphysik, 35032 Marburg, Germany

While packing motifs and crystal structures of van der Waals-bound molecular solids are essentially determined by an interplay of London dispersion and electrostatic forces, the latter often receives only little attention. Using the model system 5,7,12,14-Pentacenetetrone as an example, we use STM measurements to demonstrate the formation of different packing motifs in monolayer and bilayer films on graphite, which can be well explained by optimized electrostatic interactions in two and three dimensions, respectively. This knowledge then enables optimization of growth and the production of highly ordered strain-free films through the application of specific temperature protocols upon growth that abolish the initially formed 2D seed layer structure and yield very smooth, crystalline films with the bulk structure while avoiding dewetting that often occurs at higher temperatures. This result highlights the importance of accurately understanding interfacial properties to obtain crystalline molecular functional films.

Keywords: STM; van der Waals-Materials; Dewetting