Ultrasonic Spray Deposition of a Passivating Agent for Spray‐Coated, Methylammonium‐Free Perovskite Solar Cells

Perovskite Solar Cells In article number 2300814, Ramadan, Lidzey, and co-workers used ultra-sonic spray coating to passivate spray-cast CsFAbI3 perovskite solar cells using iso-butylammonium bromide. This process created a quasi-2D perovskite surface-layer and increased device open circuit voltage by 80 mV. Devices fabricated in this manner demonstrate power conversion efficiencies of up to 21.0%, with this work representing the first demonstration of a spray-coated surface passivation treatment that is compatible with high-throughput, roll-to-roll processing.