The perovskite bulk sample data used in this work was created in a workflow modified to make ground samples for degradation analysis. The perovskite crystals were synthesized using bench scale antisolvent vapor diffusion. The two bulk crystal samples were prepared from stock solutions of methylammonium and lead(II) iodide dissolved in gamma-Butyrolactone, and cyclohexylmethylammonium and lead(II) iodide dissolved in gamma-Butyrolactone. The crystals were grown over the course of 48 hours, then filtered and dried. Powder X-ray diffraction measurements were performed on a Rigaku MiniFlex X-ray diffractometer using CuKα radiation (1.5418 Å). Rigaku Smartlab was used to confirm the correct sample identity, reference XRD spectra were obtained from literature for [CHMA][PbI4] , and for MAPbI3 . The remaining sample was preserved in a vacuum desiccator until aging chamber longitudinal testing. Longitudinal testing was started less than 48 hours after sample synthesis. Samples were manually ground by mortar and pestle to a fine powder. Powder X-ray diffraction measurements were taken one more time, to both ensure that degradation had not occurred, and to provide a pre-degradation powder pattern.