Abstract
In this work, we are interested in the synthesis of hybrid perovskite crystals (C2H5NH3)2CdCl4, (C2H5NH3)2CuCl4 and (C2H5NH3)2Cd0.5Cu0.5Cl4, by the conventional method. X-ray diffraction indicates that these compounds crystallize at room temperature in the orthorhombic system. The values of lattice parameters and volume were determined. The values of the average crystallite size and the strain were calculated and compared by two models: Scherrer and Williamson-Hall. We note that the (C2H5NH3)2CdCl4 compound has the best crystal quality. Infrared spectroscopy (FTIR) analysis and UV–visible spectrophotometer were used. FTIR technique confirms the presence of the organic chain of the perovskite compounds. On the other hand, UV–visible absorption measurements show that the optical absorbance is higher in the visible-NIR domain for these compounds. The optical band gap (Eg) is deduced to be 3.11; 2.4 and 3.04 eV for (C2H5NH3)2CdCl4, (C2H5NH3)2CuCl4 and (C2H5NH3)2Cd0.5Cu0.5Cl4 respectively. The dispersion parameters (E0 and Ed) of these compounds were estimated using the Wemple–DiDomenico model. The different optical parameters such as refractive index, dielectric permittivity and conductivity were also determined. It is noted that the conductivity increases with the introduction of copper in (C2H5NH3)2CdCl4 compound.
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