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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 50: Poster: Organic Electronics and Photovoltaics, Molecular Excitations

CPP 50.29: Poster

Mittwoch, 22. März 2017, 18:30–21:00, P3

Measuring C60 diffusion in the low bandgap copolymer PCDTBT — •Denys Priadko¹, Thomas Müller¹, Christina Saller², Tobias Hahn¹, Julian Kahle¹, Steffen Tscheuschner¹, Peter Strohriegl^2,3, and Anna Köhler^1,3 — ¹Experimental Physics II, University of Bayreuth, 95440, Bayreuth, Germany — ²Macromolecular Chemistry I, University of Bayreuth, 95440, Germany — ³Bayreuth Institute of Macromolecular Science (BIMF), University of Bayreuth, 95440, Bayreuth, Germany

Although diffusion of fullerenes in blend or bilayer heterostructures has a strong impact on the efficiency and long-term stability of organic solar cells and other organic electronic devices, little is known about the diffusion coefficient of fullerenes in different materials. We have recently shown that the C60 diffusion in the high bandgap homopolymer polyfluorene can be reduced by a factor of 1000 by crosslinking the polymer. We have now extended our approach to the low bandgap copolymer PCDTBT. We study how crosslinking PCDTBT suppresses the diffusion of C60 into it compared to inserting a LiF layer between the PCDTBT and the C60.