SAMOP 2023 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 6: Poster I

MO 6.4: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

Femtosecond Transient Absorption Spectro-Microscopy with High Spatial Resolution on Dye Microcrystals — •Magnus Frank, Chris Rehhagen, and Stefan Lochbrunner — Institute for Physics and Department of Life, Light and Matter, University of Rostock, 18051 Rostock, Germany

Solid organic materials open a promising pathway for further improvement of optoelectronic devices like OLEDs or organic photovoltaics. The interaction of light and matter in such systems is essential for potential applications. For instance, in organic solar cells, excitons need to diffusive to an interface for charge separation - a dynamic process competing with other decay channels on the femto- and picosecond timescale. Femtosecond transient absorption is still the hallmark of dynamics determination in molecular systems, but though a lot of research has been done on the dynamics of organic solids, many fundamental aspects are still unclear. This is because measuring not only dynamics on the femtosecond timescale but also ensuring high spatial and spectral resolution is challenging. In this work, we combine classical transient absorption with microscopy allowing for spectroscopy with both high spatial and time resolution, 2.5 µm and sub-100fs respectively. We demonstrate the performance by measuring the dynamics of single microcrystals of a perylene dye, a material class known for its outstanding potential in optoelectronics.