Optical, electrical properties and characterization of (C2H5NH3)2CdCl4 compound

Synthesis and characterization of a hybrid perovskite crystal (C2H5NH3)2CdCl4 (EACC) were reported. X-ray diffraction indicates that this compound crystallizes at room temperature in the orthorhombic system with Pnma space group. The values of the average crystallite size and strain were estimated to be about 87.8 nm and (−3.50 × 10−4), respectively. On the other hand, UV-visible absorption measurements show that the optical absorbance is higher in the Ultraviolet domain. The optical band gap (Eg) is deduced to be 1.866 eV. The dispersion parameters (E0 and Ed) of this compound were estimated using the Wemple-DiDomenico model. Optical parameters such as refractive index, the dielectric permittivity and conductivity were also determined. The electric measurements were carried out in the frequency range 5 Hz-10 MHz and under different bias voltages. The capacitance behavior as a function of frequency is explained by the interface states effect. The C-V curves show three regions of electronic charge distribution: (i) accumulation, (ii) depletion and (iii) inversion. The frequency dependence of the conductivity is interpreted in term of Jonscher's law. AC conductivity increases in the high frequency domain, which indicates a hopping conduction mechanism between localized sites.