Publication date: 22nd July 2026
Aluminum oxide is known to suppress ion migration, improve crystal quality, and scavenge I2, thereby enhancing perovskite solar‑cell stability, which is crucial for upscaling and large‑scale production. We investigate the impact of blade‑coated Al2O3 nanoparticles on coupled electronic and ionic dynamics in inverted perovskite solar cells with the baseline architecture ITO/NiOx/SAM/C0.05(MA0.17FA0.83)0.95Pb(I0.83Br0.17)3/PEAI/C60/BCP/Ag. Al2O3 is introduced in three processing configurations: as a separate nanoparticle layer beneath the self‑assembled monolayer (SAM), as a nanoparticle layer on top of the SAM, and as a SAM-Al2O3 nanoparticle blend deposited in a single step. These routes are specifically chosen to be compatible with fast, large‑area fabrication and to reduce the need for conventional layer‑by‑layer deposition, thereby making interface engineering more suitable for industrial‑scale processing.
To disentangle how Al2O3 nanoparticles influence transport and stability, we combine impedance spectroscopy and fast hysteresis measurements with time‑correlated single‑photon counting in the picosecond regime and femtosecond transient absorption spectroscopy. Impedance and hysteresis measurements probe how different Al2O3 configurations affect interfacial recombination resistance, capacitive behavior, and ion migration pathways, while time-resolved optical techniques elucidate changes in carrier lifetimes, interfacial extraction dynamics, and field-induced trapping, thereby allowing us to correlate microscopic kinetics with macroscopic device metrics.
Overall, SAM-Al2O3 nano‑architectures in this ITO/NiOx‑based stack appear to offer a promising pathway toward durable, high‑efficiency perovskite photovoltaics that can be manufactured using scalable blade‑coating processes. Data collection and analysis are ongoing; preliminary and final results will be presented at the conference.
The research are supported by Alexander von Humboldt Foundation and Christiane Nüsslein-Volhard Sholarship.
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