Metal halide perovskite magic sized clusters (PMSCs) and perovskite quantum dots (PQDs) exhibit interesting and unique electronic and optical properties promising for various applications. We have found that under appropriate experimental conditions PMSCS and PQDs can be synthesized at the same time or inter-converted from one to another.  We have studied the mechanisms of growth and their inter-conversion and determined their dependence on key factors such as ligands and temperature.  In particular, we focused on understanding the binding mode of ligands on the surface of PMSCs and PQDs and how the binding affects stability and properties.  In general, stronger ligands or higher concentration of ligands favor PMSCs over PQDs.  At least under certain conditions, both PMSCs and PQDs seem to be produced at the same time, indicating parallel reaction processes.  The PMSCs and PQDs were characterized using a combination of experimental techniques including spectroscopy (UV-Vis, PL, Raman, and FTIR), NMR, XRD, mass-spec, and ultrafast laser with the goal to correlate their properties to structural details.

Mechanisms of growth and inter-conversion of metal halide perovskite magic sized clusters and quantum dots

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