Bromine/Iodine ratio effect on the optical properties and electronic structure properties of triple-cation mixed-halide perovskite

Perovskite solar cells have attained significant research interest due to their tunable bandgap and suitability for its integration with silicon solar cells and indoor applications. Indoor lighting primarily utilizes halogen or LED lamps, emitting visible light with intensities ۱۰۰-۱۰۰۰ times weaker than sunlight. Bromine incorporation improves stability and broadens the bandgap, making it more suitable for indoor lighting. This study investigated the impact of bromine content on structure and performance using UV-Vis, PL spectroscopy, IPCE, and current-voltage measurements under sunlight and LED illumination.