Fig. 2: Conversion reactions leading to the formation of FAPbBr3/MAPbBr3/FAPbI3 perovskites within TiO2 mesopores.
From: Kinetics and energetics of metal halide perovskite conversion reactions at the nanoscale
a Absolute Bragg peak intensity against time of the measured perovskite conversion reaction: integrated intensity vs time for the formation of MAPbBr3 and FAPbBr3. Reciprocal maps of b PbBr2 + MABr and c PbBr2 + FABr perovskite reactions after 1000 s. Broad ring around 1.5 (1/Å) is attributed to the isopropyl alcohol solvent. d Absolute Bragg peak intensity against time of the PbI2 + FAI perovskite conversion reaction: integrated intensity vs time of consumption of PbI2 (solid black colour) and formation of trigonal (solid red colour) and hexagonal phases of FAPbI3 (solid blue colour). e, f Reciprocal maps of the PbI2 + FAI perovskite reaction after e 50 s and f 1000 s after the solution was added. The image at 50 s shows Bragg peaks corresponding to both trigonal (black) and hexagonal (yellow) phases of FAPbI3. After 1000 s, the peaks of the trigonal phase have almost disappeared while the peaks of the hexagonal (yellow) phase have intensified.
