Using combined photoreflectance and photoluminescence for understanding optical transitions in perovskites

In this work, the optical properties of organometallic perovskites with different band gaps have been analyzed with photoluminescence and photoreflectance techniques. Band gap of the perovskites has been modified by bromine substitution of iodine in the structure. With these characterizations, the main optical transitions, both inside the band gap and higher in energies, and luminescence properties of these materials have been studied in order to further comprehend their photovoltaic properties.