Scale-Up Synthesis of Organometal Halide Perovskite Nanocrystals (MAPbX3, X = CI, Br, and I)

Ligand-assisted ball milling has attracted lot of attention due to its ability for the scalable synthesis of nanoscale organic-inorganic perovskite (OIP) materials. We found that this technique can be successfully extended for the formation of ternary OIP nanocrystals (NCs) as well as doping of transition-metal cations into the host OIP NCs. Here, a wide range of compositional variation of halogen anions (X = Cr-, Br-, I-) as well as doping of transition-metal cations (Mn2+) could be achieved by ligand-assisted ball milling, demonstrating that the strategies for cation/anion exchange can be applied to the large-scale synthesis of OIP NCs to control their photoluminescence emission and bandgap energies. Therefore, this technique provides a low-cost and facile route for mass production of exfoliated OIP NCs to overcome the most prominent challenges for future advances of OIP materials.