Berlin 2024 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 33: Hybrid and Perovskite Photovoltaics I

CPP 33.3: Vortrag

Mittwoch, 20. März 2024, 17:00–17:15, H 0106

Simulation of the Impact of Processing Conditions on the Perovskite Film Morphology — •Martin Majewski¹, Shudi Qui², Olivier Ronsin¹, Larry Lüer², Tian Du², Hans-J. Egelhaaf², and Jens Harting¹ — ¹Forschungszentrum Juelich GmbH, Helmholtz Institute Erlangen- Nuernberg (IEK-11), Dynamics of Complex Fluids and Interfaces, Cauerstraße 1, 91058 Erlangen, Germany — ²Department of Materials Science and Engineering, Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Erlangen, Germany

The solution-processed perovskite layer forms complex structures during drying. This morphology of the dry film heavily influences the efficiency of the final solar cell. The impact of the physical mechanisms on the morphology, like for example nucleation and evaporation rate, in a drying, crystallizing wet film is not really understood yet. Therefore a better understanding of the interplay of these phenomena is needed.

We present phase field simulations which are capable to describe the main physical processes: evaporation, diffusion, spontaneous nucleation, crystal growth and advection. The evaporation rate is modified in the experiment (by gas quenching) and simulation. The simulation is successfully validated against the experiments. With help of the simulation, the formation pathways for all investigated evaporation rates are uncovered. The ratio between evaporation and crystallization rate is identified as the main driver for the morphological transition from pinhole prone to pinhole free perovskite thin films.

Keywords: Phase Field Simulation; In-situ Investigation; Fully Printed Perovskite Solar Cells