Browsing by Author "Azizi, A."
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Item Electrodeposition And Characterization Of Zns Nanostructures For Solar Cells Application(Oum-El-Bouaghi University, 2018) Mentar, Loubna; Ghezali, K.; Boudine, B.; Azizi, A.In the last few years, metal oxides nanostructures have attracted quickly increasing attention, due to their very interesting properties .Among them, Zinc sulfide (ZnS) semiconductor is an appropriate candidate as window or buffer layer in solar cells applications. ZnS thin films were prepared at room temperature by electrochemical deposition using zinc sulfate and sodium thiosulfate solution at pH 2.7. In this paper, we investigated the influence of the concentration of zinc sulfate on structural, morphological and optical properties for ZnS thin films electrodeposits. SEM images demonstrated that the morphology of ZnS thin films depend greatly on the intial concentration of ZnSO4. XRD studies confirmed the presence of zinc blende structure. The optical measurements (UV-Vis) show a large band gap between 3.4 –3.9 eV depending on the concentration of zinc sulfate.Item The Electrochemical Nucleation And Properties Of The Co-cu Alloys Thin Films Deposited On Fto Substrate(Oum-El-Bouaghi University, 2012) Mentar, L.; Azizi, A.In this study, the properties of Co-Cu alloys thin films prepared by the electrodeposition method from a sulfate bath under potentiostatic conditions on a fluorine-doped tin oxide (FTO)-coated conducting glass substrate have been investigated. The electrochemical characteristics of granular alloys were studied by using cyclic voltammetry (CV) and chronoamperometry (CA) techniques. The structural behaviors of the deposits have been determined by X-ray diffraction (XRD) measurements. The magnetic properties were investigated by alternating gradient force magnetometer (AGFM) technique. The effect of deposition potential on the electrodeposition process, phase structure and magnetic behaviors has been studied. CV studies revealed that the potential of Co dissolution depends on experimental parameters such as presence of Cu ions and cathodic limit. X-ray diffraction patterns of the Co-Cu alloys thin films exhibit an fcc and hcp phases, with peaks quite close to those of the Co phase (fcc and hcp). Magnetic properties such as coercivity and saturation magnetization showed strong dependence on the crystallite size and consequently the deposition potentials.