Abstract
In this study, an inorganic/organic hybrid, Zn0.8Cd0.2S nanoparticles (ZCS) embedded in [6,6]‐phenyl‐C61‐butyric acid methyl (PCBM), as an efficient electron transport layer (ETL) for air‐processed p‐i‐n perovskite solar cells (PSCs) has been demonstrated, and the doping effect and doping mechanism are systematically studied. As compared to PCBM, ZCS@PCBM ETL exhibits improved electron extraction at the perovskite/ETL interface, increased electron transportation within the ETL, enhanced charge collection efficiency, and suppressed interfacial charge recombination, resulting in significantly improved power conversion efficiency (PCE) from 14.41 to 17.18% by 19.2%. Interestingly, the ZCS nanoparticles can protect the perovskite layer from erosion by ambient moisture, and 82% of the initial PCE for the non‐encapsulated devices with ZCS@PCBM ETL is retained after 500 h storage in the atmosphere (humidity 30–60%) versus only 13% of the initial PCE for the PCBM ETL without ZCS doping.
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