Regensburg 2013 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 31: Poster: Organic Electronics and Photovoltaics (joint session DS/HL/O/CPP)
CPP 31.7: Poster
Wednesday, March 13, 2013, 16:30–18:30, Poster C
Surface morphology of P3HT, PCBM and blends of both — •Martin Dehnert1, Mario Zerson1, Sven Hüttner2, Zhuxia Rong2, Ullrich Steiner2, and Robert Magerle1 — 1Fakultät für Naturwissenschaften, Technische Universität Chemnitz, Chemnitz, Germany — 2Cavendish Laboratory, JJ Thomson Avenue,Cambridge,U.K.
We investigate the surface morphology of thin films of pure poly(3-hexylthiophene) (P3HT), [6,6]-phenyl C61-butyric acid methyl ester (PCBM) and blends of P3HT and PCBM using atomic force microscopy (AFM) operated in multi-set point intermittent contact (MUSIC) mode. This allows for depth-resolved mapping of the mechanical properties of the top surface layer of the specimen. AFM images of pure P3HT and PCBM before and after annealing show the crystallisation behaviour of the pure materials at the film surface. Blends of P3HT and PCBM with different composition were used for investigating the morphology, the nanomechanical properties, and the composition of the top surface layer. Our results indicate that for large range of blend compositions the volume ratio of P3HT and PCBM is constant within the top surface layer. Furthermore, we observe crystallisation of PCBM in films annealed at 175°C. We discuss the impact of the surface morphology of P3HT:PCBM blends and the crystallisation of PCBM on the efficiency and lifetime of organic solar cells.