About crystal growth of hybrid bromide perovskite single crystals

The most conventional way to grow centimetres sized MAPbBr3 (MA = methyl ammonium) perovskite single crystals is the temperature rising method from dimethylformamide solution in which MAPbBr3 shows an inverse solubility/T dependence. In the present study a well-defined crystallization procedure was provided. The collective and individual effect of the many experimental variables involved were highlighted and a set of guidelines were produced to control nucleation, crystal size and the macro/micro-morphology of the crystals. Several critical aspects connected to the process or environmental conditions, such as moisture level or total reaction time, have been revealed and investigated to ensure high products reproducibility between batches and over time. The efficient self-healing capability of MAPbBr3 single crystals has been confirmed and exploited to induce a regeneration process.