Fig. 2.

Perovskite single crystals growth. a Solubility of MAPbI₃ perovskite versus temperature in HI acid. b Photos of as-grown single crystal by top-seeded solution growth method. c Reverse solubility of MAPbI₃ perovskite versus temperature in γ-butyrolactone (GBL). d Photos of as-grown halide perovskite single crystal by inverse temperature method. a is adapted with permission from ref. ⁵⁷, RSC Publishing. b is adapted with permission from ref. ⁴³, AAAS. c is adapted with permission from ref. ⁵⁸, American Institute of Physics. d is adapted with permission from ref. ⁵⁹, Springer Nature