Control of the quality and homogeneity of halide perovskites by mixed-chloride additives upon the film formation process

The roles of mixed ammonium chloride and potassium chloride additives on the growth of Cs 0.1 FA 0.9 PbI 3 perovskite film are investigated along with the surface treatment by an n -propylammonium iodide solution which produces an interfacial buffer layer.