Preparation of Layered Perovskite Self-Organized Quantum Well by Dual Source Vapor Deposition

Abstract

By simultaneous evaporation of lead iodide (PbI₂) and organic ammonium iodide (RNH₃I), highly oriented thin films of perovskite quantum-well (RNH₃) ₂PbI₄ consisting of alternating layers of inorganic semiconductor layers of PbI₄ and organic dielectric layers of RNH₃ were grown on fused quartz substrates at about 10^-4 Pa. The vacuumdeposited layered perovskite films exhibited strong exciton absorption and sharp exciton emission even at room temperature owing to their low-dimensional semiconductor nature. Further, X-ray diffraction measurement revealed that the inorganic and organic layers were oriented parallel to the film plane in the case of these vacuum-deposited films.
In addition, the simple preparation method involving the dual-source vapor deposition was found to be applicable to other layered perovskites and related cubic perovskites such as (RNH₃) ₂PbBr₄, (RNH₃) ₂SnI₄, (CH₃NH₃) PbI₃ and (CH₃NH₃) PbBr₃.