Method of forming a crystalline or polycrystalline layer of an organic-inorganic metal halide perovskite

摘要

A method of forming a crystalline or polycrystalline layer of an organic-inorganic metal halide perovskite material comprising a three-dimensional crystal structure represented by the formula AMX3, in which A represents one or more cations, including at least one of which is an organic cation, M represents at least one divalent metal cation, and X represents at least one halide anion, the method comprising the steps of: forming a first layer on the surface of a substrate, the first layer comprising an organic-inorganic halide perovskite material having a planar, layered two-dimensional crystal structure (e.g. having the form AMX4); depositing on the first layer a material comprising one or more organic halides; and reacting the first layer and the 2D crystal layer deposited thereon to form the polycrystalline layer comprising an organic-inorganic metal halide perovskite material having the formula AMX3. Also provided is an optoelectronic or photovoltaic device including an active layer comprising an organic-inorganic metal halide perovskite material comprising a three-dimensional crystal structure represented by the formula AMX3, wherein the material is obtainable using the above method.