Thermal stability of perovskites CH3NH3PbX3 (X = Cl, Br, I)

The morphology and structures of perovskites were investigated using scanning electron microscopy and X-ray diffraction methods. The samples exhibit a monophase structure. The thermal stability and degradation processes of a series of perovskites CH3NH3PbX3 (where X = Cl, Br, I) were analyzed by the thermogravimetric method. The results indicate that the thermal stability is preserved up to 335°C for X = Cl, 330°C for X = Br, and 310°C for X = I. Additionally, a correlation was established between the thermal stability of CH3NH3PbX3 perovskites and the characteristics of the halogen atom in their structure. It was concluded that the thermal stability of hybrid organic-inorganic perovskites can be adjusted by varying the halogen atom incorporated in the perovskite structure.