Halide and cation engineering in perovskites is show to widen the processing window by manipulating the presence of the sol-gel state and therefore the formation of desired perovskite phases. The lifetime and formation of the sol-gel state and present phases were analyzed using time-resolved GIWAXS and optical absorbance measurements. Learn more about specific cation and halide compositions and the effect of anti-solvent dripping on perovskite formation here.