Dresden 2020 – wissenschaftliches Programm
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CPP 86.3: Vortrag
Donnerstag, 19. März 2020, 10:00–10:15, ZEU 260
Studying the dynamics of PTB7:PCBM blend films — •Dominik Schwaiger1, Wiebke Lohstroh2, and Peter Müller-Buschbaum1,2 — 1Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Straße 1, 85748 Garching, Germany — 2Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany
In organic photovoltaics, donor - acceptor bulk heterojunctions are often used as active materials due to their superior performance compared to e.g. planar layered devices. In this optically active polymer layer, a photon is absorbed and an exciton created. After diffusion to a donor-acceptor interface, the exciton is dissipated and charge carriers can be extracted at the electrodes. A frequently applied and well-studied system is the combination of P3HT ((C10H14S)n) as electron donor and PCBM (C72H14O2) as electron acceptor. Previous studies have shown that internal dynamics and structural layout of the active layer influence its electronic properties and thus its performance in a device. A more modern, very promising low-band gap electron donor material is PTB7 ((C41H53FO4S4)n). We investigate films of PTB7, PCBM and a mixture of these two prepared out of chlorobenzene solutions. On these films we perform first quasielastic neutron scattering experiments. Hydrogen dynamics of pure compounds as well as blend films on a pico- to nanosecond timescale in a temperature range from 150 K to 400 K are investigated and compared with the established P3HT:PCBM system.