Epitaxial Electrodeposition of Methylammonium Lead Iodide Perovskites

High Resolution Image Download MS PowerPoint Slide 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 electrodeposited 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]∥PbO 2 (100)⟨001⟩ and MAPbI 3 (110)[111]∥PbO 2 (100)⟨001⟩ regardless of the Au substrate orientation, because the in-plane order of the converted film is controlled by the epitaxial PbO 2 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.