Figure shows the band gap and instability index as a function of sample composition computed using autocharacterization. The computed band gap of each composition is shown to have a linearly increasing trend with an increasing proportion of MA. Furthermore, the computed band gap values fall within a range of 1.45eV-1.52eV. This eV range and linearly increasing trend align with the anticipated results from literature as the MA proportion is increased within the FA 1-x MA x PbI 3 system, for example, Weber et al. report a linear trend within a range of 1.45eV-1.55eV .