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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Poster: Organic Semiconductors

CPP 24.31: Poster

Mittwoch, 28. März 2012, 11:00–13:00, Poster A

Correlation between polymer architecture, mesoscale structure and photovoltaic performance in PAE-PAV:fullerene bulk-heterojunction solar cells — •S. Rathgeber¹, F. Kühnlenz², H. Hoppe², D.A.M. Egbe³, S. Türk⁴, J. Perlich⁵, and R. Gehrke⁵ — ¹University Koblenz-Landau — ²Ilmenau University of Technology — ³Johannes Kepler-University Linz, Austria — ⁴Chemnitz University of Technology — ⁵DESY.

A poly(arylene-ethynylene)-alt-poly(arylene-vinylene) (PAE-PAV) statistical copolymer carrying linear and branched alkoxy side chains along the conjugated backbone in a random manner, yields, compared to its regular substituted counterparts, an improved performance in polymer:PCBM bulk-heterojunction solar cells. GiWAXS experiments show that the improved performance of the statistical copolymer may be attributed to the following structural features: 1. Well, ordered stacked domains that promote backbone planarization and thus ππ-overlap. 2. Partly face-on alignment of domains relative to the electrodes for an improved active layer electrode charge transfer. Branched side chains seem to promote face-on domain orientation. They might minimize their unfavorable contact with the interface by just bringing the CH₃ groups of the branches into direct contact with the surface so that favorable phenylene-substrate interaction can promote face-on orientation. 3. A more isotropic domain orientation throughout the active layer i.e. the backbone alignment direction has components perpendicular and parallel to the electrodes compromises between light absorption and intra-chain charge transport.