High-efficiency carbon-electrode CsPbI2Br solar cells prepared by double ion regulation of cadmium acetate additive

This study introduced CdAc₂ into the CsPbI₂Br perovskite precursor mixture, where Cd²⁺ and Ac^- ions worked synergistically to passivate vacancies of Pb²⁺ and halogen ions within the perovskite lattice. The CdAc₂-optimized carbon-based CsPbI₂Br perovskite solar cells (PSCs) demonstrated an impressive power conversion efficiency (PCE) of 14.34%. Furthermore, the unencapsulated device maintained 95% of its initial PCE after 30 days under ambient conditions (15-20% relative humidity).