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We discovered that an alcohol soluble non-fullerene small molecule perylene diimides derivative (PDIN), which is a traditional cathode interface material, can be used as a promising electron transporting material for efficient p-i-n perovskite solar cells. Surprisingly, by using 2,2,2-Trifluoroethanol as solvent for PDIN, it can easily form high quality PDIN thin film onto the perovskite layer and...
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