Study Of Composition-Structure-Performance Of The New Hybrid Perovskite

Five hybrids based on the methylamine?CH₃NH₃MBr₃?,five hybrids based on n-octylamine(C₈H₁₇NH₃)₂MBr₄)andfivebi-layerperovsikte(C₈H₁₇NH₃)₂?CH₃NH₃?MBr₇ were prepared by liquid phase synthesis.metal ions based on Cu?Zn?Ge?Sn?Pb was studied.The structures and the properties of the hybrids were characterized using X-ray diffraction?XRD?,ultraviolet and visible?UV?adsorption spectra,X-ray diffraction and Surface photo-voltage spectrum.Theperovskite-typehybridsofCH₃NH₃MBr₃,(C₈H₁₇NH₃)₂MBr₄,(C₈H₁₇NH₃)₂?CH₃NH₃?MBr₇?M=Cu?Zn?Ge?Sn?Pb?analysis shows that the structures of products are typical layer.For comparing with three categories perovskite hybrids in structure and band gap magnitude,the results demonstrate that the thickness of inorganic layer has obvious effect on the tunneling magnitude of the band gap but the organic part.The N-H…Cl hydrogen bonding was Sn>Pb>Ge and Zn>Cu.The band gap is gradually reduced in Ge>Pb>Sn.The three different hybrid perovskite materials were prepared and classified into three categories according to the different organic ligand,such as CH₃NH₃PbBr₃,(C₈H₁₇NH₃)₂PbBr₄,(C₈H₁₇NH₃)₂?CH₃NH₃?PbBr₇ nanoparticles and nanoplates.The results demonstrate that the absorption of light from the nanometer is increased to the visible region.The fluorescence peak position of the nanoplates moves in the long wavelength direction.And the response intensity of the nanoplates was significantly larger than that of the nanoparticles,and the peak position of the nanoparticles exist red shift.