2D Cs2PbI2Cl2 Nanosheets for Holistic Passivation of Inorganic CsPbI2Br Perovskite Solar Cells for Improved Efficiency and Stability

Abstract Inorganic CsPbI 2 Br perovskite solar cells (PSCs) have gained enormous research interest due to their excellent thermal and light stabilities. However, their unsatisfactory power‐conversion efficiency and poor intrinsic phase stability remain roadblocks to their further development. Herein, Cs 2 PbI 2 Cl 2 nanosheets (NSs) with the Ruddlesden–Popper (RP) structure are synthesized, and an NSs/CsPbI 2 Br/NSs heterostructure is employed to enhance both the stability and efficiency of CsPbI 2 Br solar cells. The novel Cs 2 PbI 2 Cl 2 NSs can not only passivate the top and bottom surfaces of the perovskite film and top surface of the TiO 2 film but also enhance the stability of the perovskite film. Based on the heterostructured NSs/CsPbI 2 Br/NSs inorganic perovskite film, the efficiency of the CsPbI 2 Br PSCs is improved from 15.02% to 16.65%. Moreover, the unencapsulated CsPbI 2 Br devices with the NSs/CsPbI 2 Br/NSs heterostructure sustain over 90% of their original efficiencies after being exposed to ambient conditions (≈25 °C and ≈35% RH) for 648 h. Both the UV‐light‐soaking stability (100 mW cm −1 365 nm UV light) and thermal stability ( T = 85 °C) of the optimized devices are dramatically improved in comparison with their counterparts with only a 3D active layer. Therefore, this work promotes the application of RP inorganic perovskite nanocrystals in a range of perovskite optoelectronic devices.