Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 23: Organic Photovoltaics I

CPP 23.7: Vortrag

Dienstag, 13. März 2018, 11:30–11:45, C 243

Investigation of degradation processes in low bandgap polymers for organic photovoltaics — •Franziska C. Löhrer, Christoph Senfter, and Peter Müller-Buschbaum — TU München, Physik Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching

Organic photovoltaics have experienced a drastic increase in research and are gaining impact as a feasible alternative to conventional solar cells. With their easy processability, high flexibility and tunable optical properties, organic materials such as photoactive polymers offer a wide range of potential applications. Recent efforts focus on identifying new materials in order to enhance the device performance. This has led to the development of low bandgap polymers such as PTB7 and its derivatives with reported efficiencies surpassing the 10 % limit. However, especially high-efficiency polymers are sensitive to various degradation processes, which strongly decrease their lifetime. We follow the chemical and physical changes occurring inlow bandgap polymers during light-induced aging and test ways to eliminate typical degradation pathways. The thin film morphology is investigated using real-space imaging as well as X-ray scattering techniques. Optical and IR spectroscopy methods give insights into the chemical changes inside the polymer.