Defect and Diffusion Forum Vol. 397

Abstract: This article presents the elaboration of tin oxide (SnO₂) thin films on glass substrates by spray pyrolysis technique. Our interest is on the investigation of Effect solution concentration on the structural, optical and morphological properties of the films. Structural analysis by X-ray diffraction showed that the deposited films are polycrystalline in nature with a tetragonal structure having a preferential orientation along with (1 1 0) plane. SEM micrograph proved the existence of small cracks on the film surface, EDS confirmed the composition percentage ratio of Sn and O₂ and no trace of impurities could be detected. The spectrophotometer UV-Visible confirms that it is possible to get good transparent SnO₂ films with a transmission of 80 to 90% in the visible. The values of optical band gaps vary between 3.6 and 4.0 eV depending on the spraying solution concentration.

Abstract: We propose here a method witch analyze the behavior of Quasi-square open ring frequency selective surface (FSS) by using an approach based on the wave iterative concept procedure method (WCIP) coupled to Retrieval from Scattering Parameters method . The scattering parameters calculated by WCIP for a Quasi-square open ring FSS are used, in analytical formulas, to calculate directly observable effective constitutive parameters (relative electric permittivity ε_reff , magnetic permeability μ_reff and refractive index n ) of a frequency selective surface. Results of effective constitutive parameters for a Quasi-square open ring FSS structure are presented by Simulation using MATLAB program codes translating the implementation of the proposed approach.

Abstract: In this study, we report structural, morphological and optical properties of Fe-doped SnO₂ thin layers. Fe doping concentration has evaluated from 0 to 0.6 wt.%. XRD and SEM results revealed a polycrystalline structure for Fe-doped SnO₂ thin layers. The optical transmittance of all thin layers displayed high transparency reach to 80% in the visible region. The optical gap of these layers decreases from 3.87 to 3.58 eV. The grain sizes decrease from 35 to 30 nm. The electrical resistivity of layers increases from 1.2×10^-2 to 6.8×10^-2 Ω.cm.

Abstract: In this study, Zinc oxide (ZnO) undoped and Lanthanum doped (ZnO: La) thin films were deposited on 400°C heated glass using spray pyrolysis technique with moving nozzle. The components (Zn (CH₃COO)2, 2H₂O) and (LaCl₃, 7H₂O) were used as sources to produce ZnO thin film and doped Lanthanum, respectively. Effects of dopant on the optical and structural properties of undoped and 0, 2 and 4 wt. % Lanthanum doped ZnO thin films were studied. Optical transmittance spectra of the films showed high transparency of about 98% in visible region. The optical gap for ZnO and 0, 2 and 4 wt. % La doped ZnO thin films were found to be in 3.25-3.28 [eV] range. The X-ray diffraction showed that the thin films have hexagonal wurtzite structure with a strong (002) as preferred orientation, whereas the crystalline size was ranged in 15.89-33.45 nm. The ZnO thin films are promising to be used a light emitting diodes, gas sensor and UV detectors applications.