Controllable growth of bulk cubic-phase CH3NH3PbI3 single crystal with exciting room-temperature stability

To obtain bulk cubic CH3NH3PbI3, chlorobenzene was employed to regulate the CH3NH3PbI3 gamma-butyrolactone solution with high saturated solubility at room temperature and a high yield of crystal at 60 degrees C. As a result, bulk cubic CH3NH3PbI3 single crystal was successfully synthesized for the first time in mixed-solvent method at 60 degrees C, which is a little higher than the tetragonal-cubic phase inversion temperature.