The phase diagram of a mixed halide (Br, I) hybrid perovskite obtained by synchrotron X-ray diffraction.

By using synchrotron X-ray powder diffraction, the temperature dependent phase diagram of the hybrid perovskite tri-halide compounds, methyl ammonium lead iodide (MAPbI, MA = CHNH ) and methyl ammonium lead bromide (MAPbBr), as well as of their solid solutions, has been established. The existence of a large miscibility gap between 0.29 ≤ ≤ 0.