Browsing by Author "Belahssen, O."

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    ELABORATION AND CHARACTERIZATION OF ZNO NANOSTRUCTURE THIN LAYERS
    (University of Eloued جامعة الوادي, 2018-02-05) Ghougali, M.; Belahssen, O.; Chala, A.
    ZnO thin films have been deposited onto the glass substrates by chemical spray pyrolysis technique at 500°C. The effect of precursor molarity and crystallite size on structural, optical and electrical properties has been studied. The XRD lines of the deposited ZnO were enhanced with increasing precursor molarity due to the improvement of the layers crystallinity. It was shown that the average of the crystallite size of the deposited thin layers was calculated using Debye–Scherrer formula and found in the range between 30 and 95 nm. A strong c-axis preferred orientation is observed for all of the samples. As the growth temperature increases, the crystallite orientation of the ZnO (002) plane is not changed, but the full width at half maximum gets smaller. The optical properties have been discussed in this work. The transmittance (T) and the absorbance (A) were measured and calculated. Band gap energy is considered one of the most important optical parameter, therefore measured and found ranging 3.285 eV. The increase of the electrical conductivity to maximum value of 0.0695 (Ω cm)−1 can be explained by the increase in carrier concentration of the films. A good electrical conductivity of the ZnO thin film is obtained due to the electrically low sheet resistance. ZnO can be applied in different electronic and optoelectronic applications due to its band gap, high transparency and good electrical conductivity.
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    STRUCTURAL, ELECTRICAL AND OPTICAL PROPERTIES OF IRON DOPED NiO NANOSTRUCTURE THIN LAYERS
    (University of Eloued جامعة الوادي, 2018-02-05) Ghougali, M.; Belahssen, O.; Dogga, A.; Aoun, Y.
    In this paper we studyed the structural, electrical and optical properties of the pure and iron doped thin layers of nickel oxide prepared at the molar concentration 0.1 mol/L of the nickel nitrate solution (Ni(NO3)2.6H2O) and Iron nitrate solution (FeN3O9.9H2O), thin layers of nickel oxide deposited on glass substrates under the temperature (500oC) by the pyrolytic spray technique. The diffraction results of the X-rays showed that the film layers prepared had a fcc structure and a ominant direction (111). It was noted that there was an increase in light transmission due to doping. Is reached (85%), On the other hand, the results of tests (FTIR) showed the emergence of chemical bonds (Ni-O) and (Fe-O), which appear in the wavenumber range (505-428.2 cm-1), The samples showed a remarkable decrease in electric conductivity after doping. the values of the optical band gap changed between (3.724) and (3.419 eV).