Enhancement of CsPbBr3 Hole‐Free Perovskite Solar Cells through Natural Dye Modifications

Inorganic perovskite solar cells have attracted considerable interest for their thermal stability. In this study, turmeric and carotene natural dyes as additives for refining CsPbBr 3 film crystal structure are explored. These dyes enhance light absorption and carrier transport by increasing CsPbBr 3 crystal size and reducing defects. Capitalizing on the dyes’ light‐absorbing nature and their impact on device energy levels, turmeric and carotene additives elevate efficiency from 5.35% to 9.78% and 7.81%, respectively. Remarkably, device stability extends 90 days without encapsulation. In this work, an eco‐friendly, economical method to optimize perovskite crystallization is introduced and optoelectronic properties in inorganic perovskite solar cells are enhanced.