Herein, doping of methylammonium lead iodide perovskite thin films with bromine ions is
successfully performed for the first time using the aerosol-assisted chemical vapour deposition
process. Depending on the doping levels, photoluminescence spectra are shifted relative to their
bandgap values. Detailed analysis of scanning electron microscope images showed that
increasing the bromine levels linearly increased the grain sizes. The unchanged amount of
detected lead provided evidence for the controlled processing conditions. Both bulk and surface
compositional techniques confirmed the deposition of marginally iodine rich perovskite thin
films
