Prevention of ion migration in lead halide perovskites upon plugging the anion vacancies with PbSe islands

Abstract

To circumvent the issue of halide ion exchange in perovskites, we have decorated CsPbBr₃ and CsPbI₃ nanocrystals with different sized PbSe nanoparticles and demonstrated that it effectively prevents anion exchange reaction in CsPbBr₃/CsPbI₃ nanoheterostructures (NHSs) as a consequence of halide vacancy passivation by the more covalent selenide anion.