ИСТИНА

Application of many kinds of functional materials in a form of thin films is of high interest. The development of simple, cost effective, easy scalable and universal technique of thin films production remains an important task for material sciences. Chemical deposition methods, MOCVD and MOCSD, seems to be most perspective, however their require a special design of compatible metal-organic precursors. Here, we proposed alkaline (Na, K), alkaline earth (AEE, Ca, Sr, Ba), rare earth element (REE, La-Lu) and transition metal (Cu, Ni, Fe, Co, Mn) aliphatic carboxylates, beta-diketonates and their mixed-ligand complexes with ancillary neutral donor ligands (polyglymes and polyamines) as metal-organic precursors for MOCSD and MOCVD. The aforementioned homo- and mixed-ligand complexes were synthesized via ligand exchange reactions in either aqua or anhydrous conditions. Reaction of metal carboxylates or beta-diketonates with ancillary donor ligands leads to formation of highly soluble or/and volatile mononuclear mixed ligand complexes. Controlled hydrolysis of mixed-ligand complexes allows us to stabilize the precursor solution in alcohols and carbonic acids. The intermediate products of hydrolysis being polynuclear hydroxoclusters, e.g. Ln6(OH)8(Carb)n(HCarb)m were isolated in a form of single crystals and powders and were thoroughly studied by XRD and PDF methods (in-lab and synchrotron sources) and DFT simulations. Designed compounds were successfully used for deposition of large variety of oxide thin films, e. g. LaLuO3, LuFeO3, LaNiO3, LaMnO3, Y2O3, La2O3, etc. Textured thin films of Tl-based superconductors were also prepared by two stage process by ex-situ thallination of polycrystalline (Ca,Ba)xCuO2 and (Ca,Sr)xCuO2 thin films on IBAD-MgO/Hastelloy-based substrate. Perfluorinated metal-organic precursors were applied for fabrication of up-converting NaYF4:Yb,Er thin films and nanoparticles for increasing the efficiency solar cells.