Complete Conversion of PbI₂ to Methyl Ammonium PbI₃ Improves Perovskite Solar Cell Efficiency

One major disadvantage to the two-step deposition method of perovskite films is the incomplete conversion from PbI₂ to perovskite resulting in the presence of a thick PbI₂ layer, which hinders charge carrier transportation. In this study, a quaternary ammonium salt has been used to manipulate the crystallization of PbI₂ in the first deposition step, which leads to facile incorporation of the methylammonium iodide into the Pb-I lattice and promotes the conversion of PbI₂ to perovskite leading to improved device performance.