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Pure δ‐formamidinium lead triiodide (δ‐FAPbI3) single crystal for highly efficient perovskite solar cell (PCS) with long‐term stability is prepared by a new method consisting of liquid phase reaction of FAI and PbI2 in N,N‐dimethyl formamide and antisolvent crystallization using acetonitrile. In this method, the incorporation of any impurity into the crystal is excluded by the molecular recognition...
Perovskite Solar Cells
In article number 2305246, Sang Hyuk Im, Woo‐Sik Kim, and co‐workers present a novel method that enhances inverted perovskite solar cell efficiency by synthesizing pure δ‐formamidinium lead triiodide (δ‐FAPbI3) single crystals. The champion device achieves 23.48% efficiency, and improves to 25.07% with 3‐(aminomethyl)pyridine treatment. Even after 1,000 hours at 85 °C under...
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