Single Crystallization of CsPbBr Perovskite from Supersaturated Organic Solutions Optimized Through Solubility Studies.

We demonstrate the fabrication of millimeter-sized single crystals of 0D-CsPbBr grown in a supersaturated solution consisting of organic solvents without HBr (aq). One of the precursors, CsBr, was dissolved in ethylene glycol (EG) mixed with dimethyl sulfoxide, which is a good solvent for the other precursor, PbBr. At a solvent ratio of 20 vol % EG, the solubility of cesium bromide decreased and the title compound, CsPbBr, was selectively formed, whereas, with an EG ratio of 80 vol %, 3D-CsPbBr was formed.