Browsing by Author "Bougdira, J."

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    Properties of (NiO)1-x(ZnO)x thin films deposited by spray pyrolysis
    (Springer, 2015) Herissi, L.; Hadjeris, L.; Aida, M.S.; Bougdira, J.
    Themain goal of the presentwork is the study of (NiO)1-x(ZnO)xmetal oxide thin films to determine their applicability in optoelectronic devices. For this purpose, well adherent films with x = 0, 0.25, 0.50, 0.75, and 1, were deposited by spray pyrolysis technique on glass substrates heated at 400 °C. Nickel chloride hexahydrate and zinc acetate dihydrate were used as precursors. Structural, electrical, optical and morphological properties of films have been studied. The obtained results indicate the formation ofNiO and ZnO phases mixed in defined proportions for intermediate compositions and the lattice constant of NiO increases with the nominal fraction x of Zn. The dark electrical conductivity at room temperature varied between 10−9 and 10−5 Ω cm−1. A transmittance in the visible region situated between 50% and 80% was observed. The band-gap changes of the samples are situated between 3.21 eV and 3.74 eV.
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    Substrate effect temperature on Cu2ZnSnS4 thin films deposited by ultrasonic technique
    (Oum-El-Bouaghi University, 2011) Daranfed, W.; Fassi, R.; Hafdallah, A.; Ynineb, F.; Attaf, N.; .Aida, M.S; Hadjeris, L.; Rinnert, H.; Bougdira, J.
    Cu2ZnSnS4 (CZTS) thin films are a potential candidate for absorber layer in thin film solar cells. CZTS films were deposited by spray ultrasonic technique. An aqueous solution composed of copper chloride, zinc acetate, tin chloride and thiourea like precursors is sprayed on heated glass substrates at various temperatures. The substrate temperature was changed from 280°C to 360°C in order to investigate its influence on CZTS films properties. The DRX analyses indicated that Cu2ZnSnS4 films have nanocrystalline structure with (112) preferential orientation and a crystalline size, ranged from 30 to 50 nm with increasing substrate temperature. The obtained films are composed of SnS, ZnO, ZnS and Cu2ZnSnS4 phases. The optical films characterization was carried by the measurement of UV-visible transmission. The optical gap was deduced from the absorption spectra. Broad emissions at around 1.27 eV was observed in the photoluminescence spectrum measured at 77 K.