Dresden 2011 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Organic Semiconductors
CPP 8.10: Poster
Monday, March 14, 2011, 17:30–19:30, P2
Targeted Side Chain Substitution for Tuning the Photovoltaic Performance of Conjugated Polymers — •S. Rathgeber1, D. Bastos de Toledo2, F. Kühnlenz3, R. Jadhav3, G. Adam4, H. Hoppe3, and D.A.M. Egbe4 — 1Johannes-Gutenberg-University Mainz, Institute for Physics, Mainz — 2MPI Mainz, Polymer Physics, Mainz — 3TU Ilmenau, Institute for Physics, Ilmenau — 4Linz Institute for Organic Solar Cells, Johannes-Kepler-University Linz, Austria
We used targeted side chain (SC) substitution for tuning the performance of poly(arylene-ethynylene)-alt-poly(arylene-vinylene) (PAE-PAV) copolymers in polymer:PCBM bulk heterojunction (BHJ) solar cells. The layered structure (degree of order, inter-layer- and pipi-stacking distance) was systematically modified by linear alkyloxy- and/or branched 2-ethylhexyloxy SC substitution. We identified a correlation between polymer architecture, structural properties as investigated by x-ray scattering techniques, photophysical characteristics and photovoltaic performance in the device. Optimization led to a statistical copolymer, comprising linear and branched SC statistically distributed along the backbone. This material combines the benefits of linear- and branched-substituted polymers i.e. high supramolecular order in combination with good solubility at low volume fraction of isolating SC. It exhibits high charge carrier mobilities and high power conversion efficiencies of 3.8% in BHJ solar cells - the present state-of-the-art value for PAV-based materials. We consider this approach to be transferable to other material classes. (Macromolecules 2010, 43, 306; Macromolecules 2010, 43, 1261; J. Mater. Chem. 2010, 20, 9726)