Properties of the hybrid perovskite with MgO nano powders

Glass/FTO/compact TiO₂mesoporous TiO₂perovskite layer dispersed MgO nanopowder structured samples were prepared from a mixture of CH₃NH₃PM₃ (methylammonium lead iodide, MAPbI₃) and MgO with a sol-gel process involving PbI₂+MgO and CH₃NH₃I (methylammonium iodide, MAI). The phase and color change of MAPbI₃ with MgO was examined by XRD and micro-Raman analyses, and by using a uvvis-nir-colorimeter. Optical microscopy and field emission scanning electron microscopy (FE-SEM) were employed to evaluate the evolution of the microstructure. The XRD analysis confirmed that MAPbI₃ with MgO added degrades more slowly compared to MAPbI₃ alone due to Mg(OH)₂ formation. Micro-Raman analysis results showed only the existence of MAPbI₃. Optical microscopy and FE-SEM revealed degradation in color and microstructural change in all samples as time passed. However, the degradation was confirmed to occur more slowly for the MAPbI₃ with added MgO. A lab color analysis with uvvis-nir also supported the results of the color changes by degradation. These results indicate that the degradation of MAPbI₃ may be dramatically delayed by the addition of nano MgO powders.