Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 32: Poster: Organic Semiconductors
CPP 32.5: Poster
Mittwoch, 13. März 2013, 16:30–18:30, Poster C
Structural Aging and Degradation of Polymer Solar Cells — •Christoph Schaffer1, Jan Perlich2, Stephan V. Roth2, and Peter Müller-Buschbaum1 — 1Technische Universität München, Physik-Department - Lehrstuhl Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching — 2HASYLAB at DESY, Notkestr. 85, 22607 Hamburg
One of the major challenges in OPV is to elongate their lifetimes. Several mechanisms of organic solar cell degradation have been proposed in literature within the last years. Most of the mechanisms are related to chemical alteration of the applied materials, such as photo-bleaching and oxidation of the active organic layer and the metal contacts or the diffusion of oxygen or water into the organic layer. However, insufficient research has been done on determining transitions of the nanomorphology of the active layer of bulk heterojunction (BHJ) polymer solar cells as an effect of aging. These transitions are expected to strongly affect the properties of solar cells since the active layer morphology plays a crucial role in the energy conversion process. In our investigations, we study the influence of illumination on the morphology of the active layers of PCPDTBT:PC71BM solar cells. Therefore, advanced scattering techniques such as grazing incidence small angle x-ray Scattering (GISAXS) are performed both in-situ on operating PCPDTBT:PC71BM solar cells and ex-situ on pre-aged polymer-blend films. The findings are supplemented with UV/Vis and characteristic IV curve measurements.