Berlin 2015 – scientific programme

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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: Talk

Wednesday, March 18, 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.