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- W4386094946 abstract "The production of pure formamidinium lead iodide (FAPbI 3 ) is crucial to ensure high‐efficiency perovskite solar cells and such pure FAPbI 3 is obtainable from crystallization process because impurities from the reagents are removable by molecular recognition effect. In addition, it is important to develop a green crystallization process for the production of FAPbI 3 single crystals. Via broad screening of chemicals, here, triethylphosphate and acetonitrile are selected as nontoxic solvent and antisolvent, respectively, for the liquid–liquid reaction of FAI and PbI 2 and the antisolvent crystallization. The new green crystallization process produces pure δ‐FAPbI 3 single crystals, which are applicable to fabricate α‐FAPbI 3 perovskite solar cells. Due to the reduced trap states in the δ‐FAPbI 3 single crystals, the corresponding α‐FAPbI 3 perovskite solar cells have 22.61% efficiency (average = 20.65 ± 0.86% across 50 devices) and show good operational stability under continuous 1 sun illumination at 50 °C for 1000 h." @default.
- W4386094946 created "2023-08-24" @default.
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- W4386094946 date "2023-08-30" @default.
- W4386094946 modified "2023-10-15" @default.
- W4386094946 title "Green method to prepare pure δ‐FAPbI<sub>3</sub> crystals for fabrication of highly efficient perovskite solar cells" @default.
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- W4386094946 doi "https://doi.org/10.1002/solr.202300496" @default.
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