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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 57: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics VIII
CPP 57.5: Vortrag
Freitag, 13. März 2026, 12:30–12:45, ZEU/LICH
Photo-physics of symmetric and asymmetric ITIC-2F non-fullerene acceptors in organic solar cells — •Shahidul Alam1,2, Nisreen Alshehri2, Michael Bulgakov3, Zerui Li4, Khawla Alkhezaim2, Maryam Alqurashi2, Oleksandr Matiash2, Vojtech Nadazdy5, Martin Hager6, Ulrich S Schubert6, Vladimir Dyakonov3, Harald Hoppe6, Peter Müller-Buschbaum4, Andreas Sperlich3, and Frédéric Laquai1,2 — 1LMU Munich — 2KAUST, Saudi Arabia — 3University of Wurzburg — 4TU Munich — 5Slovak Academy of Sciences, Slovak Republic — 6FSU Jena
Fluorination is an effective strategy to tune the electronic and structural properties of organic semiconductors by lowering frontier orbital energies, enhancing intermolecular interactions, and improving stability. We investigated ITIC and its fluorinated derivatives, sITIC-2F and aITIC-2F, in blends with PBDB-T and its halogenated analogue PM6 to elucidate the effects of fluorination on molecular packing and energetics. Optically detected magnetic resonance reveals triplet excitons in all pristine materials and blends, with their donor-acceptor distribution governed by fluorination. These results demonstrate that fluorination effectively modulates molecular organization and excited-state dynamics, leading to improved structure-property-performance relationships in organic solar cells.
Keywords: Organic Semiconductors; Organic Solar Cells; Non-Fullerene Acceptors; Fluorination; Structure-Property-Relation