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Among a series of self-n-doped stable and highly conductive fullerene ammonium salts(σ = 1~2 S/m),fullerene ammonium diiodide(PCBDANI)acts as a excellent solvent-resistant and thicknesstolerant cathode interfacial layer to facilitate electron transfer and improve PCE of OSCs devices with different active layers.Herein,comprehensive methods are used to study the structure-property relationship in model compound fullerene ammonium iodide(PCBANI).