Regensburg 2022 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 5: Organic Thin Films, Organic-Inorganic Interfaces
DS 5.5: Vortrag
Montag, 5. September 2022, 12:30–12:45, H17
The Role of Molecular Packing in Strongly Coupled Metal-Organic Hybrid Structures — •Maximilian Rödel1, Polina Lisinetskaya2, Maximilian Rudloff1, Thomas Stark3, Jochen Manara3, Roland Mitric2, and Jens Pflaum1,3 — 1Experimental Physics VI, University of Würzburg, 97074 Würzburg — 2Institut für Physikalische und Theoretische Chemie, University of Würzburg, 97074 Würzburg — 3ZAE Bayern, 97074 Würzburg
The coupling between excited states in fluorinated zinc-phthalocyanine thin films (FnZnPc, with n = 0,4,8,16) and surface plasmons in gold layers underneath enables unique insights in the resulting exciton-plasmon polariton coupling phenoma and their energetics. In particular, the increase of the molecular van der Waals radii by the degree of fluorination offers an additional degree of freedom to analyze the role of molecular orientation and aggregation on the resulting dispersion curves. As such, we were able to identify up to four anticrossings in the layered Au/FnZnPc samples which can be attributed to: 1) a coexisting F16ZnPc β -polymorph, 2) monomers, preferentially located at the metal interface, and 3) aggregated α -phase regions located within the FnZnPc films. While energy and splitting of the monomer-related anticrossing are determined by the average tilting and the close proximity to the metal surface, the coupling associated with the aggregate can be consistently described by a change in FnZnPc dipole density. Supported by structural data and TDDFT calculations in combinations with a Jaynes-Cummings model, Au/FnZnPc bilayers proof to be a versatile platform to study the primary light-matter interactions.