A rapid method for growing high-quality bulk hybrid perovskite single crystals has been developed using inverse temperature crystallization (ITC). This technique enables the rapid growth of methylammonium lead trihalide (MAPbX3) single crystals, such as MAPbBr3 and MAPbI3, at a rate an order of magnitude faster than previous methods. The process relies on the observed decrease in solubility of MAPbX3 in certain solvents at elevated temperatures, allowing for rapid crystallization when the solution is cooled. The method allows for precise control over crystal size and shape by adjusting crystallization parameters. The resulting crystals exhibit transport properties and trap densities comparable to the highest quality MAPbX3 reported to date, making them suitable for optoelectronic applications. The study highlights the inverse solubility behavior of MAPbX3 in specific solvents, which was previously unobserved in hybrid perovskites. This phenomenon enables the ITC method, which involves heating the solution to a high temperature and then cooling it to initiate crystallization. The method allows for continuous crystal growth by replacing the depleted solution and using templates to control crystal shape. The crystals grown using ITC show excellent optical and transport properties, with carrier diffusion lengths of up to 10 micrometers for MAPbI3 and 4.3 micrometers for MAPbBr3. The carrier mobility and trap density of the crystals are comparable to those obtained through traditional methods, demonstrating the effectiveness of the ITC approach. The study also discusses the thermodynamic stability of the precipitated perovskite compounds, which is influenced by the formation of complexes between precursors and solvents. The ITC method represents a significant advancement in perovskite crystal growth, enabling the rapid production of high-quality single crystals with potential applications in solar cells, light-emitting diodes, and photodetectors. The findings demonstrate that the ITC method can produce high-quality perovskite single crystals within minutes, significantly improving the efficiency and versatility of perovskite crystal growth.A rapid method for growing high-quality bulk hybrid perovskite single crystals has been developed using inverse temperature crystallization (ITC). This technique enables the rapid growth of methylammonium lead trihalide (MAPbX3) single crystals, such as MAPbBr3 and MAPbI3, at a rate an order of magnitude faster than previous methods. The process relies on the observed decrease in solubility of MAPbX3 in certain solvents at elevated temperatures, allowing for rapid crystallization when the solution is cooled. The method allows for precise control over crystal size and shape by adjusting crystallization parameters. The resulting crystals exhibit transport properties and trap densities comparable to the highest quality MAPbX3 reported to date, making them suitable for optoelectronic applications. The study highlights the inverse solubility behavior of MAPbX3 in specific solvents, which was previously unobserved in hybrid perovskites. This phenomenon enables the ITC method, which involves heating the solution to a high temperature and then cooling it to initiate crystallization. The method allows for continuous crystal growth by replacing the depleted solution and using templates to control crystal shape. The crystals grown using ITC show excellent optical and transport properties, with carrier diffusion lengths of up to 10 micrometers for MAPbI3 and 4.3 micrometers for MAPbBr3. The carrier mobility and trap density of the crystals are comparable to those obtained through traditional methods, demonstrating the effectiveness of the ITC approach. The study also discusses the thermodynamic stability of the precipitated perovskite compounds, which is influenced by the formation of complexes between precursors and solvents. The ITC method represents a significant advancement in perovskite crystal growth, enabling the rapid production of high-quality single crystals with potential applications in solar cells, light-emitting diodes, and photodetectors. The findings demonstrate that the ITC method can produce high-quality perovskite single crystals within minutes, significantly improving the efficiency and versatility of perovskite crystal growth.