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• W2994244014 abstract "Abstract The performance of perovskite solar cells is sensitive to detrimental defects, which are prone to accumulate at the interfaces and grain boundaries of bulk perovskite films. Defect passivation at each region will lead to reduced trap density and thus less nonradiative recombination loss. However, it is challenging to passivate defects at both the grain boundaries and the bottom charge transport layer/perovskite interface, mainly due to the solvent incompatibility and complexity in perovskite formation. Here SnO 2 ‐KCl composite electron transport layer (ETL) is utilized in planar perovskite solar cells to simultaneously passivate the defects at the ETL/perovskite interface and the grain boundaries of perovskite film. The K and Cl ions at the ETL/perovskite interface passivate the ETL/perovskite contact. Meanwhile, K ions from the ETL can diffuse through the perovskite film and passivate the grain boundaries. An enhancement of open‐circuit voltage from 1.077 to 1.137 V and a corresponding power conversion efficiency increasing from 20.2% to 22.2% are achieved for the devices using SnO 2 ‐KCl composite ETL. The composite ETL strategy reported herein provides an avenue for defect passivation to further increase the efficiency of perovskite solar cells." @default.
• W2994244014 created "2019-12-13" @default.
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• W2994244014 date "2019-12-05" @default.
• W2994244014 modified "2023-10-15" @default.
• W2994244014 title "Simultaneous Contact and Grain‐Boundary Passivation in Planar Perovskite Solar Cells Using SnO₂‐KCl Composite Electron Transport Layer" @default.
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• W2994244014 doi "https://doi.org/10.1002/aenm.201903083" @default.
• W2994244014 hasPublicationYear "2019" @default.
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