Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 39: Poster III
HL 39.16: Poster
Mittwoch, 19. März 2025, 15:00–18:00, P3
Spectral Signatures and Kinetics of Y6 Aggregates and Disordered Phase via Absorption Spectroscopy — •Daniel Kroh1,2, Xinyue Xu2, Trevor Smith2, and Anna Köhler1 — 1Soft Matter Optoelectronics, EPII, Universität Bayreuth, Bayreuth, Germany — 2School of Chemistry, University of Melbourne, Melbourne, Australia
Recent advancements in single-junction organic solar cells (OSCs) utilizing non-fullerene acceptors (NFAs) have significantly increased power conversion efficiencies (PCEs) to over 19%. This remarkable progress is largely attributed to the introduction of the "Y-series" NFAs, with Y6 being the most notable example. Motivated by these achievements, numerous research groups are investigating the relationship between film morphologies and their exceptional optoelectronic properties, especially when blended with the donor material PM6.
In our study, we employed temperature-dependent steady-state UV-Vis absorption and photoluminescence spectroscopy combined with Franck-Condon analysis to identify the spectral signatures of two types of aggregates and the disordered phase of Y6 in solution. We observed that all three phases are also present in neat Y6 films and blend films with PM6. Through transient absorption measurements, we further explored the excitation kinetics and transient absorption spectral signatures of these phases, providing deeper insights into their behavior.
Keywords: aggregation; transient absorption; kinetics; global fit