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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 73: Organic Electronics and Photovoltaics II

CPP 73.2: Talk

Wednesday, March 18, 2020, 16:30–16:45, ZEU 260

Simulation of active layer formation and stability in solution-processed organic solar cells — •Olivier Ronsin and Jens Harting — Helmholtz Institute Erlangen- Nürnberg for Renewable Energy, Forschungszentrum Jülich, Fürther Straße 248, 90429 Nürnberg, Germany

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

We propose a phase-field simulation framework to determine the dry film structure. To this end, evaporation, crystal nucleation and growth, liquid-liquid phase separation are taken into account. We show the impact of the thermodynamic (especially miscibility) and kinetic (evaporation, diffusion and crystal growth rate) parameters on the time-dependent morphology of the wet film during drying up to the dry state. We also investigate the structural evolution of the dry film.