Perovskite Oxides and Halides: Synthesis, Crystal Structures and Hybrid Materials
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Duk-Young Jung Department of Chemistry, Sungkyun Advanced Institute of Nano Technology, Sungkyunkwan University, Suwon City 16419, Korea The perovskite is a large family of compounds having crystal structures related to the mineral CaTiO3. The perovskite oxide is one of the most studied oxides, for instance, BaTiO3 and PbTiO3 thanks to ferroelectric response. In addition, the discovery of high-temperature cuprate superconductors was also closely related with perovskites of La2-xBaxCuO4, followed by the YBa2Cu3O7-δ, which are 2D varieties of the perovskite structure. Other important oxide perovskites include the colossal magnetoresistance in LaxCa1-xMnO3. Recently, the halide perovskites, CsPbX3 as well as hybrid (RNH4)PbX3 (X = Cl, Br, I) demonstrate exciting properties such as photovoltaic, light emitting and water splitting. The synthetic conditions of halide and oxide perovskites should be considered to suggest the formation mechanisms and defect chemistry based on solid state reaction and solution crystallization in liquid media. The Cs-Pb-X phases have been reported and interestingly the correlation between the crystal structures and optical properties is still debating. The recent results of immobilization of CsPbX3 in the confined nanopores and photoconductivity of single crystal Cs4PbBr6 will be also presented. |