Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Poster Session IV

CPP 46.31: Poster

Mittwoch, 14. März 2018, 11:00–13:00, Poster A

Investigation of low band-gap polymers for highly efficient organic solar cells — •Christoph Bilko, Franziska C. Löhrer, and Peter Müller-Buschbaum — TU München, Physik Department, LS Funktionelle Materialien, 85748 Garching

In contrast to silicon-based solar cells, organic photovoltaics offer a wide range of advantages. Due to their flexibility and tunable optical properties, sun harvesting in areas not accessible to conventional solar cells could be greatly increased using organic solar cells, e.g. on curved or flexible surfaces. Other advantages are the lighter weight and potentially lower production costs. In the last years, the formerly poor efficiencies of organic photovoltaics have been greatly increased. However, further improvements in the device architecture and stability are needed to reach industrially relevant efficiencies. To enhance the performance of solar cells, recent research efforts focus on identifying new highly efficient materials. One way to achieve this is the development of low band-gap polymers, which absorb light of lower energies and can, therefore, increase the overall absorption. Prominent representatives for these kinds of polymers are PTB7 and its derivatives, which can achieve efficiencies of over 10 %. Our work focuses on the comparison of different low band-gap polymers regarding their optical and structural properties. Applied characterization techniques include optical absorption and microscopy measurements as well as X-ray scattering methods. Exploratory solar cells link the power conversion efficiency to parameters such as the active layer composition and morphology.