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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Organic Electronics and Photovoltaics III
CPP 36.6: Talk
Thursday, March 21, 2024, 10:45–11:00, H 0110
Correlating the morphology of PTQ-2F:BTP-4F organic solar cells through scattering and real space methods — •Lukas V. Spanier1, Julian E. Heger1, Renjun Guo1, Matthias Schwartzkopf2, Harishankar Balakrishnan3, Rachid Houssaini3, Stephan V. Roth2, Achim Hartschuh3, and Peter Müller-Buschbaum1,4 — 1TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 2DESY, 22607 Hamburg, Germany — 3LMU, Department Chemie und CeNS, 81377 Munich, Germany — 4TUM, MLZ, 85748 Garching, Germany
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 the changes in morphology and performance stability of PTQ-2F:BTP-4F organic solar cells processed from various halogenated and non-halogenated solvents, utilizing operando grazing-incidence wide and small angle X-ray scattering (GIWAXS/GISAXS) during illumination and solar cell operation. We further show the impact of solvents on the mesoscopic distribution of small molecules within the bulk heterojunction through scattering-type scanning near-field optical microscopy.