Facile synthesis of organic-inorganic hybrid perovskite CH3NH3PbI3 microcrystals

The organic-inorganic hybrid perovskite CH3NH3PbI3 is becoming an interesting material in the field of optoelectronic application. Most of the previous research focused on thin film and crystal growth of this material. Here we describe the rapid preparation of perovskite CH3NH3PbI3 microcrystals using a facile synthesis method at room temperature. By using ultrasound assisted solutions of PbI2 and CH3NH3I precursors in acid solvents, a single-phase perovskite was obtained. X-ray diffraction data reveal that the prepared CH3NH3PbI3 crystals possess a tetragonal structure. FE-SEM and TEM images show the morphology and grain size of CH3NH3PbI3 crystals. UV-VIS-NIR and PL measurements indicate that the perovskite crystals show a slight reduced bandgap, accompanying with red shift, compared with the perovskite polycrystalline films. DSC-TGA demonstrates that the perovskite microcrystals show the better thermal stability than that of the perovskite films, which suggests the wide potential application.