Epitaxial Electrodeposition of Methylammonium Lead Iodide Perovskites

Abstract

Here, an electrochemical/chemical route is introduced to deposit both textured and epitaxial films of methylammonium lead iodide (MAPbI<sub>3</sub>) 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<sub>3</sub> films are MAPbI<sub>3</sub>(001)[010]∥PbO<sub>2</sub>(100)<001> and MAPbI<sub>3</sub>(110)[111]∥PbO<sub>2</sub>(100)<001> regardless of the Au substrate orientation, because the in-plane order of the converted film is controlled by the epitaxial PbO<sub>2</sub> precursor film. The textured and epitaxial MAPbI<sub>3</sub> films both have trap densities lower than and photoluminescence intensities higher than those of polycrystalline films produced by spin coating.