Realizing High-Efficiency and Stable Perovskite Solar Cells via Double-Perovskite Nanocrystal Passivation

Organic–inorganic hybrid perovskites and double perovskites are both perovskite materials that have attracted much attention recently due to their excellent photoelectric properties. Hybrid perovskites have suitable band gaps but poor intrinsic stability. In contrast, double perovskites have a wide band gap but excellent stability. Therefore, we developed a strategy to modify hybrid-perovskite solar cells by utilizing double-perovskite (Cs2AgBi0.1In0.9Cl6) nanocrystals to improve the stability of the devices. We have demonstrated that this strategy can effectively suppress nonradiative recombination, and reduce defects without affecting the absorption of the absorption layer. The performance and stability of MAPbI3 solar cells fabricated by this strategy have been significantly improved. In addition, the FAPbI3 solar cells prepared by this strategy show better performance, indicating that this strategy has a certain universality.