Berlin 2024 – scientific programme
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DS: Fachverband Dünne Schichten
DS 17: Organic Thin Films, Organic-Inorganic Interfaces
DS 17.2: Talk
Thursday, March 21, 2024, 15:15–15:30, A 060
Towards measuring charge transfer in hybrid structures of sub-monolayer dye films on 2D materials — •Tim Völzer1,2, Erik von der Oelsnitz1,2, Julian Schröer1, Tobias Korn1,2, and Stefan Lochbrunner1,2 — 1Institute of Physics, University of Rostock, Germany — 2Department "Life, Light & Matter", University of Rostock, Germany
Coating transition metal dichalcogenides (TMDCs) with dye molecules creates hybrid structures offering a playground for ultrafast charge (or energy) transfer exploitable for optoelectronics. Typically, nanometer molecular films are applied to roughly match the crystal density of states. In this case, however, interfacial transfer processes compete with intermolecular interactions and the dynamics may be limited by diffusion towards the interface. Thus, we apply monomeric dye coatings, where the molecules lie far from and do not interact with each other. We perform transient absorption spectroscopy aiming for the ultrafast hole transfer from the dye Perylene Orange (PO) towards monolayer tungsten diselenide and the electron transfer in the reverse direction. As a reference sample, we use PO on hexagonal boron nitride, where no charge or energy transfer can occur and the slow dynamics of the isolated molecules is represented.
Keywords: Hybrid structures; Heterostructures; Charge transfer; Transient absorption spectroscopy