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Additives are widely adopted for efficient perovskite solar cells (PSCs), and proper additive design contributes a lot to PSCs’ various breakthroughs. Herein, a novel additive of N,1‐fluoroformamidinium iodide (F‐FAI), whose cation replaces one amino group in guanidinium (GA+) with electron‐withdrawing fluorine group, is synthesized and applied as the additive for PSCs. The electron‐withdrawing effect...
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