Suppressed Mn doping in organometal halide perovskite nanocrystals by formation of two-dimensional (CHNH)MnCl.

The additional (CHNH)MnCl phase was observed upon increasing the Mn dopant concentration, preventing the formation of Mn-doped CHNHPbCl NCs. We introduce an approach to avoid the formation of an impurity phase by switching the sequence for the addition of MnCl in the crystal growth process.

Mechanistic Insight into Surface Defect Control in Perovskite Nanocrystals: Ligands Terminate the Valence Transition from Pb to Metallic Pb.

Organolead halide perovskite nanocrystals (NCs) have emerged as promising materials for various optoelectronic applications. However, their practical applications have been limited due to low structural integrity and poor luminescence stability associated with fast attachment-detachment dynamics of surface capping molecules during postprocessing. At present, a framework for understanding how the functional additives interact with surface moieties of organolead halide perovskites is not available.