Epitaxial Electrodeposition of Methylammonium Lead Iodide Perovskites

An electrochemical/chemical route is introduced to deposit both textured and epitaxial films of methylammonium lead iodide (MAPbI(3)) perovskites. The perovskite films are produced by chemical conversion of lead dioxide films that have been electro-deposited as either textured or epitaxial films onto [111]-textured Au and [100] and [111] single-crystal Au substrates. The epitaxial relationships for the MAPbI(3) films are MAPbI(3)(001) - [010]parallel to PbO2(100)< 001 > and MAPbI(3)(110)[111]parallel to PbO2(100)< 001 > regardless of the Au substrate orientation, because the in-plane order of the converted film is controlled by the epitaldal PbO2 precursor film. The textured and epitaxial MAPbI(3) films both have trap densities lower than and photoluminescence intensities higher than those of polycrystalline films produced by spin coating.