Browsing by Author "Kermadi, Salim"

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    Characterization of Thin Layer SnO 2 /Glass by Neutrons Reflectometry
    (Scientific.net, 2009) Khelladi, Mohamed Fadel; Izerrouken, M.; Kermadi, Salim; Tala-Ighil, Razika
    The thermal annealing behavior of the SnO2 thin films elaborated by sol-gel method has been studied by the neutrons reflectivity technique. From the fit of the experimental data using Parratt32 software program developed at HMI, Berlin, scattering length density, thickness and roughness are extracted. The obtained results show that the film thickness increases with the increasing annealing temperature, and the roughness is higher at 500 °C. Whereas, approximately, the same scattering length density is obtained after each annealing temperature
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    Effect of H2O Content on Structure and Optical Properties of TiO2 Thin Films Derived by Sol-Gel Dip-Coating Process at Low Temperature
    (2008) Kermadi, Salim; Agoudjil, N.; Sali, S.; Tala-Ighil, Razika
    Pure TiO2 thin films were prepared on the glass substrates by sol–gel dip coating technique with titanium (IV) isopropoxide including simultaneously acetylacetone and acetic acid as stabilizing reagents. The effect of the amount of water in the sol on structural and optical properties of TiO2 thin films was investigated. The structural and optical properties of post- sintered films for 1 hour at 500°C in air were investigated By X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–Vis spectroscopy and ellipsometry. The results showed a simultaneous appearance of the rutile and the anatase phases with different rutile / anatase proportions for all samples. The increase of the water content leads to the decrease of rutile / anatase proportion. The crystalline size varies from 7.94 to 24.84 nm for the anatase phase and from 17.70 to 22.31 nm for the rutile phase. The optical measurements showed that the structure was strongly influenced by the water / alcoxides molar ratios. In comparison with the bulk material, the TiO2 thin films prepared by this way exhibit low refractive index in the range of 2.15 and high band gap energy narrowing from 3.88 to 3.95 eV for direct allowed transition and from 3.09 to 3.39 eV for indirect allowed transition according to the cristallinity degree and the rutile /anatase weight fraction.
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    Neutron characterization of thin layer SnO2/Glass by neutrons reflectometry
    (2009) Khelladi, M. F.; Izerrouken, M.; Kermadi, Salim; Tala-Ighil, Razika; Sali, S.; Boumaour, Messaoud
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    Photoluminescence and structure of ZnO films deposited on i substrates by chemical spray deposition
    (2009) Sali, S.; Tala-Ighil, Razika; Kermadi, Salim; Kechouane, M.; Boumaour, Messaoud
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    Sol-Gel synthesis of SiO2-TiO2 film as antireflection coating on silicon for photovoltaic application
    (2009) Kermadi, Salim; Agoudjil, N.; Sali, S.; Tala-Ighil, Razika; Boumaour, Messaoud