Regensburg 2025 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Hybrid and Perovskite Photovoltaics III

CPP 24.4: Talk

Wednesday, March 19, 2025, 10:15–10:30, H38

Simulation of the impact of processing conditions for solution-processed thick perovskite layers — •Martin Majewski¹, Shudi Qiu², Larry Lüer², Vincent M. Le Corre², Tian Du², Olivier J.J. Ronsin¹, Christoph J. Brabec², Hans-Joachim Egelhaaf², and Jens Hartin¹ — ¹Helmholtz Institue Erlange-Nuernberg, Cauerstraße 1, 91058 Erlangen, Germany — ²Institute of Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander Universitaet Erlangen Nuernberg

Fabricating thick (1000 nm) solution-processed perovskite layers is expected to increase the efficiency of carbon-contact-based solar cells compared to thinner (500 nm) films. However, increasing only the deposited layer thickness often results in buried voids inside the dry film. Recently, we have developed a theoretical framework based on Phase Field simulations. With the help of the simulations, it is possible to explain why voids form in the film. The crystals nucleate at random spots inside the liquid film. The movement of the condensed-vapor interface, due to evaporation, leads to an agglomeration of the crystals at the film surface. The crystals block further evaporation and the remaining solvent is the origin of the buried voids inside the dry film. We explain how adding seeds on the substrate before coating the thick film can prevent this. In this case, processing conditions have to be modified compared to standard operating procedures for thin films. The theoretical expectations can be verified experimentally, leading to a performance improvement of the devices.

Keywords: Perovskite photovoltaics; Phase field simulation; Fully printed