Browsing by Author "BENHAOUA Boubaker"

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Deposition and characterization of n type Lanthanum doped zinc oxide /p cuprous oxide layers
(University Of Eloued جامعة الوادي, 2020-02-23) ALLAG Nassiba; BENHAOUA Boubaker; SAIED Chahnez
In this study, CuO thin films were deposited by hydrothermal deposition (chemical bath or aqueous solution) methods onto a pure and La doped ZnO substrat and followed by a thermal oxidation constant temperatures at 300ºC to produce an oxide based p n junction. In a pre vious work , the formation and characterizations of pure and La doped ZnO thin film with different Lanthanum concentrations (from 1, to 5 wt %) on glass substrates using spray pyrolysis technique at 375 °C were studied . Our aim is to study and investig ate the effect of CuCl 2 .2H 2 O concentration as precursor, annealing process, and the process time during the deposition, while keeping solution temperature at 65ºC , on the structural, morphological, optical, and electrical properties of the prepared thin fi lms. Characterization of p n junction thin films by X ray diffraction, Scanning electron microscopy ,UV Visble ,FTIR Spectroscopy and photoluminescence, respectively, were performed. The XRD pattern of Cu x O/ZnO exhibits five diffraction peaks (the 34.47° correspond to the (002) direction of ZnO and the others additional two peaks at 2 θ values of around 35.447° and 38.684° which correspond to the (and (002)/ (111) planes of pure monoclinic structure of CuO) CuO).No additional peaks related to other phases such as Cu, Cu(OH)2 or Cu 2 O were detected suggesting that the grown CuO are of high purity The photoluminescence signal of the thin films CuO showed a narrow band gap of (2.1 eV) . The estimated thicknesses of the CuO layer the crystallite sizes were calculate d 69.8 nm .The SEM image indicates that CuO adhere to ZnO s robustly and more stable.
Study and elaboration of Fe doped SnO 2 thin films for the capture of Li ions
(University Of Eloued جامعة الوادي, 2020-02-23) SEGUENI Leila; BENHAOUA Boubaker
In this study , tin oxide (SnO 2 ) films were deposi ted on 480°C heated glass by spray pyrolysis with moving nozzle SPMN )). Tin chloride (SnCl 2 , 2H 2 O) was used as precursor solution, iron chloride (FeCl 3 ) and lithium chloride (LiCl 2 ) were used as doping sources. Effect of high/low Fe and Li doping concentration on structural, morphological, optical, and electrical properties of SnO 2 thin films. The t ransmittance of all Fe doped SnO 2 thin films was more than 78% in the visible region. The o ptical gap was found to be in 3.64 3.58 eV. The ex istence of functional groups and the chemical bonding is confirmed by Fourier transform infrared spectroscopy (FTIR) spectra. X ray diffraction study showed that elaborated thin films have a polycrystalline structure with tetragonal crystal. The preferenti al orientation shift from 211 ) toward 110 ) plane for 1, 2 and 4 wt.% Fe/Sn only, whereas crystalline size was ranged in 57 36 nm. An increase in electrical resistivity increases from 1.2×10 4 to 3.4×10 3 Ω cm. The Hall effect measurements have shown n type for non doped SnO 2 thereafter the type conductivity changes to p type for more than 2wt.% Fe doped SnO 2 thin films.