Hybrid perovskites, composed of an organic cation, inside a post transition metal halide framework, have emerged as simple, low cost solar cell materials, with power conversion efficiencies that are competitive with silicon. The structure of the most extensively studied perovskites, CH3NH3PbI3, has been shown to possess a number of subtle structural features, such ion migration and static distortions. Although its not clear what role these have on their photovoltaic effect. We propose to structural characterize two related systems to separate some of the structural parameters to gain a better correlation with the physical and structural properties.
