Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Organic Electronics and Photovoltaics: OPV II (joint session CPP, HL, TT)
CPP 36.11: Vortrag
Mittwoch, 18. März 2015, 12:15–12:30, C 130
Control of Structural Order and Phase Separation in Polymer-Fullerene Solar Cells — •Christian Kästner1, Daniel A. M. Egbe2, and Harald Hoppe1 — 1Institute of Physics, Technische Universität Ilmenau, Ilmenau, Germany — 2Linz Institute for Organic Solar Cells, Johannes Kepler University, Linz, Austria
It is common knowledge that polymer aggregation and phase separation in blends with fullerene derivatives is a delicate issue and crucially impacts the photovoltaic parameters of polymer based solar cells. On the one side, strongly intermixed polymer:fullerene phases provide large interfacial area and consequently large exciton dissociation rates and thus charge carrier generation. On the other side, pristine, and eligibly ordered, polymer or fullerene domains support exciton delocalization and efficient charge transport. Herein, we present versatile routes to control the morphology by applying side-chain modifications to the polymer and fullerene, tuning the polymer:fullerene blend ratio and controlling the order within the bulk heterojunction via ternary blends. On the basis of an anthracene-containing poly(p-phenylene-ethynylene)-alt-poly(p-phenylene-vinylene) (PPE-PPV) copolymer backbone we investigated a number of these structure-property-relations. As an imposing result it is demonstrated that via manipulation of molecular structure and processing parameters enables tuning bulk morphologies at will.