The Synthesis And Performance Study Of Perovskite Materials

In this thesis,we studied two kinds of material start from a typical structure of perovskite:（1）Pb Zrx Ti_1-xO₃ referred to as PZT,a inorganic perovskite material;（2）CH₃NH₃PbI₃,a organic-inorganic hybrid halogenated perovskite material.The studies of PZT were focused on the vicinity of morphotropic phase boundary（MPB）that the ratio of Zr:Ti was 52:48,while the area with higher Zr:Ti ratio was less studied.We used inorganic salts of lead acetate,zirconium nitrate and butyl titanate as the raw materials,synthesized PZT 95/5 material by sol-gel method.The proper calcination temperature of the preparation process of PZT 95/5 films was determined and the theoretical grain size of the PZT 95/5 particles obtained after calcination was calculated by analyzing the XRD patterns.Organic-inorganic hybrid halogenated perovskite material was a new material and CH₃NH₃PbI₃ was prepared by chemical synthesis in most studies.In this thesis,polycrystalline CH₃NH₃ I was synthesis by chemical reaction that methyl ammonium,hydrogen iodide and PbI₂ as raw materials.CH₃NH₃PbI₃ nanobelts was synthesis through two-steps that based on the chemical vapor deposition method.PbI₂ and CH₃NH₃PbI₃ nanobelts were regular shapes that can be determined by optical and SEM images which was obtained by optical microscope and SEM,respectively.The photoluminescence spectrum of CH₃NH₃PbI₃ with excitation light of 532 nm was obtained and the center band gap level is 1.56 e V.We could see that the intensity is almost 0 in the regions that higher 1.63 e V（760 nm）and lower 1.49 e V（830 nm）,which means there was no defect in the structure of CH₃NH₃PbI₃ crystal.The CH₃NH₃PbI₃ material has regular shapes and strong photoluminescence,and is a material that has a promising prospect in the field of laser.