Abstract
The instant disclosure provides a method for preparing a perovskite crystal, including a mixing step, a crystallization step, a diluting step and a recrystallization step. The mixing step includes adding a first precursor and a second precursor both having a supersaturated concentration to a solvent for forming a mixture. The crystallization step includes stirring the mixture for initiating a reaction between the first and second precursors in the mixture to form a perovskite powder. The diluting step includes adding the solvent to the perovskite under stirring for dissociating the perovskite powder into the solvent to form a clear solution. Therefore, the recrystallization step includes adding a crystal seed into the clear solution for performing crystal growth on the crystal seed to prepare the perovskite crystal.