IMF2017

The importance of CH₃NH₃XI₃ or MAXI₃ (X=Pb and Ba) organic-inorganic hybrid materials has increased dramatically because of their potential use in solar cells. However, the basic structural characterization of these interesting materials remains sparse. In particular, advanced techniques, such as X-ray photoemission (XPS) and photoelectron emission spectroscopy (PES), could be employed to examine electronic structure and formation mechanism of these important perovskite materials. Here, systematic XPS and PES studies are employed to determine the electronic structure and chemical compositions of MAXI₃ powders. The results from this study help in explaining the possible electronic structure of the materials. The finding also leads to an awareness of the reactions, which in turn allow us to perform post synthetic reactions to form the organic-inorganic metal iodide perovskites.