Characterization of Optical and Photoemission Properties of Triple Cation Perovskite Films

Today, perovskite thin-film electronics require specific semiconductor materials for high performance. Modern indoor perovskite solar cells can be significantly improved if the classic MAPbI3 semiconductor is replaced by triple-cation compositions with a band gap greater than 1.6 eV. However, simply changing the anion proportion in a perovskite can lead to changes in the Goldschmidt tolerance factor and initiate phase separation. In this study, one of the most stable CsFAMAPb(IBr)3 thin films was used to investigate new stable compositions under UV light. Here, we used six different proportions of halogens with a fixed ratio of cations in the thin films, which were experimentally tested to determine their optical and photoluminescence parameters and assess their potential for indoor photovoltaic applications.