Browsing by Author "Mentar, Loubna"

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    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.
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    The Effect Of Bath Temperature On The Electrodeposition Of Zinc Oxide Nanostructures Via Nitrates Solution
    (Oum-El-Bouaghi University, 2014) Mentar, Loubna; Lahmar, Hala; Mohamed Redha, Khelladia; Amor, Azizi
    Zinc oxide (ZnO) nanostructures were electrodeposited onto ITO coated glass substrates from nitrate medium at different temperatures. The electrochemical deposition process was analyzed and the characteristics of the nanostructures were discussed. The electrochemical results showed that the deposition temperature had an important effect on the current density and the film morphology. From the Mott-Schottky measurements, the flat-band potential and the donor density for the ZnO nanostructure are determined. The morphological, structural and optical properties were studied by scanning electron microscopy (SEM), x-ray diffraction techniques (XRD) and spectrophotometer in the ultraviolet UV–visible region. SEM images demonstrated that the morphology of ZnO nanostructures depend greatly on the bath temperature. The XRD patterns revealed the formation of phase-pure ZnO nanostructure with hexagonal wurtzite phase. The optical transmittance spectrum gave a high transmittance of 82 % at low temperatures, and the optical band-gap (Eg) of the ZnO nanostructures was between 3.25~3.49 eV.