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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster 1
CPP 12.64: Poster
Montag, 5. September 2022, 18:00–20:00, P1
Investigation of solvent dependent morphology degradation of PTQ-2F:BTP-4F bulk heterojunctions — •Lukas V. Spanier1, Renjun Guo1, Julian E. Heger1, Yuqin Zou1, Matthias Nuber2, Matthias Schwartzkopf3, Hristo Iglev2, Reinhard Kienberger2, Stephan V. Roth3, and Peter Müller-Buschbaum1,4 — 1TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — 2TU München, Physik-Department, LS Laser- und Röntgenphysik, 85748 Garching — 3DESY, 22607 Hamburg — 4MLZ, TU München, 85748 Garching
Lately, organic solar cells (OSCs) have gained increasing attention due to their rapidly increasing efficiencies as well as the relatively easy scalability in their manufacture. To make the manufacturing process of the bulk-heterojunction (BHJ) more environmentally friendly, increased efforts have recently been made to use halogen-free solvents, which, however, can lead to reduced efficiencies.
We investigate and compare the changes in morphology and performance stability of PTQ10:BTP-4F OSCs processed from various solvents, utilising operando grazing-incidence small and wide angle X-ray scattering during illumination and solar cell operation. We further show the impact of solvent composition on the charge carrier generation in the respective BHJs using time-resolved transient absorption spectroscopy, analysing the connection between thin-film morphology and device performance in polymer:non-fullerene acceptor OSCs.