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Impedance Spectroscope (IS) and (I-V) Characterization of Organic Nanostructured Perovskite (CH3NH3PbCl3) Layer

Ola Asad , Muhammad Anwar Batal

 

Organic nanostructured perovskite layer (CH3NH3PbCl3 ) was prepared. Using XRD structural properties was studied, it showed that the crystalline structure of the perovskite is cubic. The crystalline constants were calculated (a = b = c = 5.5874 A0). From the absorption spectrum and by using Tauc relationship, energy band gap was calculated, it was found that (Eg =2.985 eV), the absorption spectrum was fitting with theoretical spectrum relay on Mathcad program, and it had been analyses to seven individual spectrum beams depending on Gaussian subject, and it was noted that the most probable transitions are those corresponding to wavelengths(368.821, 325.416, 304.673) nm. From (I-V) characterization determined at different temperatures, ideal factor is determined, that’s mean that as prepared perovskite layer within a certain system behaves as semi-ideal diode. Barrier height was calculated ( ψ = 7.228 ×10-20 eV ), which was very small value, it’s negligible, indicating the absence of interface barriers; it has been found that the transport of charge carriers within the perovskite compound is (3D - VRH) depending on the determination of conductivity dimensions. In order to know the mechanism of electrical transport and the equivalent electrical circuit of the studied system, impedance spectroscope (IS) was carried out, indicating that electrical model is followed model Cole-Cole, static and dynamic resistors was determined, the relaxation time (τp) (7.66×10-1, 1.18×10-1, 1.62×10-2) sec were calculated by extrapolation method at (30, 40, 50) 0C, activationenergy was calculated (Ea = 1.63 eV), then the dipole moment (D = 2.699 Debye) was determined