Browsing by Author "Nassiba Allag"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Effect of La doping on ZnO thin films by spray pyrolysis
    (University of Eloued, 2019-02-25) Nassiba Allag; Leila Segueni; Chahnez Said; Boubaker Benhaoua; Djamel Barani; Brahim Gasmi
    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 . (Zn (CH3COO)2, 2H2O) and (LaCl3, 7H2O) were used as sources of ZnO and Lanthanum respectively. Effects of dopant on the optical, structural and opto-electrical properties of undoped and 2,4,6 wt. % Lanthanum doped ZnO thin films .Optical transmittance spectra of the films showed high transparency of about 98% in visible region. The optical gap,for ZnO and 0,2,4wt. % La doped ZnO thin films ,were found to be in 3.25-3.28 eV range . 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.. ZnO thin films are promising to be used a light emitting diodes ,gas sensor and UV detectors
  • No Thumbnail Available
    Item
    Influence of Fe doping concentration on SnO2 thin layers
    (Universty of Eloued جامعة الوادي, 2019-02-24) t Leila Segueni; Nassiba Allag; Boubaker Benhaoua; Achour Rahal; Atmane Benhaoua; Brahim Gasmi
    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 polycrystalline structure for Fe-doped SnO2 thin layers. The optical transmittance of all thin layers displayed high transparency reach to 80% in visible region. The optical gap of these thin layers decreases from 3.87 to 3.58 eV. The crystalline sizes decrease from 35 to 30 nm. Electrical resistivity of thin layers increases from 1.2×10-2 to 6.8×10-2 Ω .cm.