Journal Article perovskite solar cells solar cells stability 1 µm-thick photoactive layer CsPbI3 CsPbI3 quantum dots CsPbI3 quantum dots solar cells FAPbI3 quantum dot P/N homojunctions atomic-resolution block copolymers carrier transport charge transfer charge-transfer doping covalent organic frameworks defect passivation di-n-propylamine dual‐site ligands guanidinium thiocyanate hybrid heterointerfaces interfaces interfacial passivation large-scale printing technology ligand exchange metal halide perovskites molecular interactions morphology nonfullerenes perovskite quantum dots