Preparation, Structure, Film Deposition And Properties Of The Layered Perovskite-type Organic-inorganic Hybrid (RNH₃)₂CuX₄

Layered perovskite-type organic-inorganic hybrids are sort of the assembly of the organic and inorganic units on the molecular scale. In the microelectronics field, the potential application of the hybrids is in good prospect for their novel properties. The inorganic components mainly reported in this study are copper halides. On the basis of Changing the organic components compose to modulate the band structure of the hybrids, study the change of the halogen on structure and properties of different materials. The deposition of films is also taken into accountThe dissertation systems studied the synthesis and the structures of the organic-inorganic hybrids with chemical formula (RNH₃)₂CuX₄ and the expected layered perovskite-type structure, where RNH₂= aniline, para-phenylene diamine, benzyl amine, 2-Phenylethylamine and X= Cl, Br. The hybrids were successfully synthesized by liquid phase reactions. The optimum synthetic conditions were found out.The structures of the hybrids at room temperature and the interactions between the different components in the hybrids were characterized and analyzed by XRD, SEM, FTIR and TG-DSC. The results demonstrated that all hybrids feature layered structures except the organic species is para-phenylene diamine, and the interlayer distance increases depend linearly on the increasing of the organic alkyl chain lengths. The layer structures are presumably from the arrangements of the organic cations. The different interactions between the metal and the halogen, the inorganic and the organic, the organic and the organic components make the obvious influence on the structure forming and the stabilities of the hybrids.The films of organic-inorganic hybrid compounds were prepared by spin-coating method. The results demonstrated that spin-coated films are higher oriented and the (0 0 1) planes are perpendicular to the substrate surface. The continuous films are easily prepared when the organic components are benzyl amine and 2-Phenylethylamine. The room-temperature UV-Vis absorption spectra and the room-temperature fluorescence spectra of the films were used to examine the effect on the optical properties of varying X and varying n, respectively. The results indicated that the inorganic species control the energy band on a large scope, while the organic species could give a micro-tuning on their optical properties. When the inorganic species are changed from chloride to bromide, the fluorescence intensity of the hybrids reduced.The carrier mobility of the hybrid films were measured by Hall Effect, which influenced by the systems, and highly by the spin-coated process. The carrier mobility is related to the arrangements of the organic cations, which decreased according to the sequence of 2-Phenylethylamine, benzyl amine, aniline, para-phenylene diamine. The carrier mobility of copper chloride 2-3 times to copper bromide.