Structure And Characterization Of Layered Perovskite-typed Hybrids Based On Stannous Iodide By Doping Copper

Layered perovskite-type organic-inorganic hybrids are a type of new materials which compounded by organic ammonium salt and inorganic sheets on the molecular level, provided with natural quantum well band structure and without phase interface which exist in ordinary composite materials. The appearances of organic-inorganic hybrids give the possibilities of combining the useful properties of organic and inorganic materials on the molecular scale. It allows us select different units to synthetize miscellaneous hybrid materials according to requirements.However, layered perovskite-type organic-inorganic hybrids did not meet the operating requirements concerning electric properties, take channel in FETs for example, their carrier mobility highly approach to A-Si but carrier concentration lower and resistivity higher at the same time. Thus, it should have important significance to applied research of hybrid materials by enhance carrier concentration and conductivity in the premise of tiny mobility decay.This dissertation focuses on the structure and electric properties of p-type doped layered hybrids (R-NH3)2SnI4, β-Phenylethylamine and2-Bromoethylamine hydrobromide have be chosen as organic units. Powdery crystal of two series were composed by liquid phase method and the films were fabricated by spin-coated either. The structures and electric properties of the acquired products at room temperature were characterized and analyzed by X-ray diffraction, SEM, UV-vis absorption spectrum and Hall effect measurement system. Besides, the doping quantity were determined by atomic absorption spectrometry.The results demonstrate that the template effect from organic units is critical factor to hybrids structures, band gap and electric properties; The products of β-Phenylethylamine series in which template effect is stronger show a high degree of preferred orientation along (002l) direction, the reduced structural distortion both decrease band gap and recipient defects. Carriers are significantly influenced by impurity scattering. The decrease of carrier mobility is considerable in the process of doping quantity increasing. Oppositely, the products of2-Bromoethylamine series in which template effect is weaker contain a mass of recipient defects, result in major mobility. But the electron-attracting group-Br introduced by the carbon chain R fail to play a significant role in reducing structural distortion on BX6octahedra. Carriers are rarely influenced by impurity scattering. Meanwhile, the decrease of carrier mobility is unconspicuous in the process of doping quantity increasing. Take all the electric properties parameters into consideration, the advantages of semi-conductor hybrid materials we obtain from two above series are relatively higher carrier mobility, lower resistivity and the easiness in fabrication of films.