TY  - CONF
AU  - Majewski, Martin
AU  - Qiu, Shudi
AU  - Ronsin, Olivier J.
AU  - Du, Tian
AU  - Egelhaaf, Hans-J.
AU  - Brabec, Christoph
AU  - Harting, Jens
TI  - Simulation of the impact of processing conditions for solution-processed thick perovskite layers
PB  - FUNDACIO DE LA COMUNITAT VALENCIANA SCITO València
M1  - FZJ-2025-03671
SP  - -
PY  - 2025
AB  - 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. This is detrimental to the efficiency of the device. Recently, we have developed a theoretical framework based on Phase Field simulations[1]. It is capable of describing the main physical processes determining the morphology: evaporation, diffusion, spontaneous nucleation, crystal growth, and advection[2]. 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.
T2  - 12º nternational Conference on Hybrid and Organic Photovoltaics
CY  - 12 May 2025 - 14 May 2025, Roma (Italy)
Y2  - 12 May 2025 - 14 May 2025
M2  - Roma, Italy
LB  - PUB:(DE-HGF)8 ; PUB:(DE-HGF)7
DO  - DOI:10.29363/nanoge.hopv.2025.078
UR  - https://juser.fz-juelich.de/record/1046031
ER  -