Patent ID: 6676749
Filing Date: 2004-01-13
Classification: C30B

Abstract:
A method for preparing a layered perovskite compound thin film with organic ammonium layers and inorganic layers, said layered perovskite compound thin film having a superlattice structure represented by the general formula A2MX4, where A is an organic ammonium molecule, M is a group 4 element or transition metal and X is halogen (Cl, Br, I), and in which a layer of organic ammonium molecule A and a layer of inorganic halide MX4 are alternately stacked, wherein an organic solvent solution having dissolved therein an organic ammonium molecule or a mixture of an organic ammonium molecule and an inorganic halide is dropped onto to the surface of a water solution having dissolved therein a water-soluble organic ammonium molecular and an inorganic halide to form a monomolecular film of an organic amine hydrohalic acid salt having a long-chain alkyl group and simultaneously to react said formed monomolecular film with said inorganic halide in said water solution so as to form a monomolecular film of a layered perovskite with organic ammonium layers and inorganic layers on the surface of said water solution, and then said formed monomolecular film is transferred onto a substrate by using the Langmuir-Blodgett method.