Journal Article perovskite solar cells stability CsPbBr3 acid dissociation constant active‐matrix displays alkyl ammonium salts blue LEDs charge carrier recombination charge extraction defect passivation deterministic aperiodic nanostructures external quantum efficiency flexible nanomanufacturing functional groups fused ring electron acceptors hole density interface engineering interfacial charge loss interfacial engineering lead leakage light management light manipulation light outcoupling light scattering light trapping molecular orientation moth-eye nanostructures nonfullerene solar cells organic optoelectronics