Crystal‐Size‐Induced Band Gap Tuning in Perovskite Films

A comprehensive picture explaining the effect of crystal size in metal halide perovskite films on their opto-electronic characteristics is currently lacking. We report that nanocrystallites exhibit a wider band gap due to concurrent quantum confinement and dependent structural effects, with latter being remarkably distinct attributed perturbation from surface affecting structure core. This phenomenon might assist photo-induced charge separation within devices employing mesoporous layers as they restrict present them. demonstrate widely applicable it ubiquitous different compositions deposition methods employed fabrication state-of-the-art solar cells. convenient effective way tune perovskites.