Kubicki, Dominik J.Prochowicz, DanielPinon, ArthurStevanato, GabrieleHofstetter, AlbertZakeeruddin, Shaik M.Gratzel, MichaelEmsley, Lyndon2019-02-152019-02-152019-02-152019-02-0710.1039/c8ta11457ahttps://infoscience.epfl.ch/handle/20.500.14299/154483WOS:000457546000040Lead halide perovskites belong to a broad class of compounds with appealing optoelectronic and photovoltaic properties. Doping with transition metal ions such as Mn2+ and Co2+ has recently been reported to substantially enhance luminescence and stability of these materials. However, so far atomic-level evidence for incorporation of the dopants into perovskite phases has been missing. Here, we introduce a general and straightforward method for confirming the substitutional doping of bulk perovskite phases with paramagnetic dopants. Using Cs-133 and H-1 solid-state MAS NMR relaxation measurements we provide for the first time direct evidence that, consistent with current understanding, Mn2+ is incorporated into the perovskite lattice of CsPbCl3 and CsPbBr3 and does not form clusters. We also show that, contrary to current conviction, Co2+ is not incorporated into the perovskite lattice of MAPbI(3).Chemistry, PhysicalEnergy & FuelsMaterials Science, MultidisciplinaryChemistryEnergy & FuelsMaterials Sciencespin-lattice-relaxationsolid-state nmrhybrid perovskitesenergy-transferquantum dotsanion-exchangenanocrystalsdynamicsspectroscopysubstitutionDoping and phase segregation in Mn2+- and Co2+-doped lead halide perovskites from Cs-133 and H-1 NMR relaxation enhancementtext::journal::journal article::research article