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.
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