PbBr-based layered perovskite organic–inorganic superlattice having hole-transporting carbazole chromophore in organic layer

Abstract

Oriented thin films of lead bromide-based layered perovskite having an organic–inorganic superlattice structure, which is combined with a lead bromide semiconductor layer and an organic layer of carbazole-linked ammonium molecules, were successfully prepared by spin-coating from dimethylformamide solution in which stoichiometric amounts of PbBr2 and carbazolelinked ammonium bromides were dissolved. The thin films exhibited sharp exciton absorption around 400 nm which is characteristic of PbBr-based layered perovskite in addition to absorptions due to carbazole chromophore peaking around 350 and 300 nm. X-ray diffraction measurement demonstrated that the layer structure was oriented parallel to the film plane: the spin-coated films exhibited only (0 0 n) reflections, where c-axis is in the stacking direction of the layer structure. 2004 Elsevier B.V. All rights reserved.