Synthesis and characterization of ambient-processed all-inorganic perovskite CsPbBr2Cl micro-crystals and rods

Highly crystalline, all-inorganic CsPbBr2Cl perovskite micro-crystals and rods were prepared by the inexpensive solution-based processing method. The optical, morphological, and thermal properties of the prepared CsPbBr2Cl micro-crystals and micro-rods have been characterized by various sophisticated techniques like UV-visible spectroscopy (UV-Vis), photoluminescence (PL), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), thermogravimetric analysis (TGA), differential thermal analysis (DTA), and differential scanning calorimetry (DSC). The optically active nature of prepared crystals was confirmed by the UV-Vis and PL study. The XRD pattern of the micro-crystals and rods exhibited the cubic phase. SEM micrographs depicted the micro-size of the prepared perovskite crystal structures. The EDX analysis confirmed the atomic composition of the micro-crystals and rods. FTIR revealed the existence of various functional groups and stretchings like C-H, C-Br, and C-Cl in the synthesized crystals. Thermal analysis-TGA, DTA, and DSC showed that the CsPbBr2Cl micro-rods reduced the weight loss and the decomposition temperature of crystals increased by 87 celcius. The most important and notable observation of this study is to improve the thermal stability of perovskite material by the shape tuning of CsPbBr2Cl micro-crystals. In the field of a large domain of perovskites, the growth of micro-rods signifies a novel concept in terms of the thermal stability of the perovskite crystal phase at a higher temperature.