Composition-Dependent Crystallization of Wide-Bandgap Perovskite Solar Cells via Intense Pulsed Light Annealing

Perovskite solar cells have emerged as a major research focus due to their high efficiency and suitability for tandem integration. Intense pulsed light (IPL) annealing offers a rapid, low-cost route to convert precursor films into perovskite absorbers within milliseconds. Here, we study IPL processing of ∼1.68 eV wide-bandgap perovskites with varying bromine content (0.15Br and 0.24Br). IPL enables improved crystallization, film uniformity, and microstructure, resulting in enhanced efficiency and stability. A 1.68 eV single-junction device fabricated via IPL achieves 22.41% efficiency with excellent durability.