Regensburg 2019 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 39: Focus: Controlling Phase Formation Dynamics in Solution Processed Semiconductors - organized by Christoph Brabec, Jens Harting and Hans-Joachim Egelhaaf

CPP 39.5: Talk

Wednesday, April 3, 2019, 16:30–16:45, H14

Simulation of active layer formation in solution-processed organic solar cells — •Olivier Ronsin and Jens Harting — Forschungszentrum Jülich GmbH, Helmholtz Institute Erlangen-Nürnberg (IEK-11), Dynamics of Complex Fluids and Interfaces, Fürther Straße 248, 90429 Nürnberg, Germany

Solution-processed organic bulk-heterojunction active layers form sophisticated structures during the drying of the wet-deposited solution, because of complex physical processes such as crystallization and/or phase separation. This structure highly impacts the photovoltaic performance. In order to reach significant improvements, a better understanding of the physics driving the active layer formation is strongly needed.

We propose a phase-field simulation framework to determine the dry film structure. To this end, evaporation, crystal nucleation and growth, phase separation are taken into account as well as concentration-dependent diffusion coefficients. The model's behaviour for these basic physical processes will be shown, as well as simulation results for evaporation-induced phase separation and crystallization. First quantitative simulations for real photovoltaic systems and the comparison with in-situ experimental characterization on the drying structure will be presented.