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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Poster Session III - Charged Soft Matter and Theory and Simulation
CPP 22.10: Poster
Mittwoch, 24. März 2021, 16:30–18:30, CPPp
Dynamics in polymer-fullerene blends for photovoltaic applications — •Dominik Schwaiger1, Wiebke Lohstroh2, and Peter Müller-Buschbaum1,2 — 1Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien James-Franck-Straße 1, 85748 Garching — 2Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstraße 1, 85748 Garching
In organic photovoltaics, donor - acceptor bulk heterojunctions are often used as active layer due to their superior performance compared to e.g. planar structured devices. In this optically active polymer layer, photons are absorbed and excitons are created. After diffusion to a donor-acceptor interface, the excitons are dissipated and charge carriers can be extracted from the electrodes. A promising low-bandgap electron donor material is the conjugated polymer PTB7. Besides a large number of studies on structure and electrical properties, the level of knowledge about dynamics in this system is very limited. We investigated films of PTB7, the fullerene derivate PCBM and different blends of these two, prepared out of chlorobenzene solutions. Quasielastic neutron scattering experiments were done at the cold neutron time of flight spectrometer TOFTOF (MLZ, Garching). Hydrogen dynamics of pure compounds as well as the blend films are investigated on a pico- to nanosecond timescale in a temperature range from 150 K to 400 K. Results are set into context of photovoltaic performance studies and increase the knowledge base, which is needed for the design of new materials to push the field of organic photovoltaics.