Fouzia Cherkaoui El Moursli

Effect of ITO and Mo coated glass substrates on electrodeposited Cu 2 ZnSnS 4 thin films

Cu2ZnSnS4 (CZTS) thin films were elaborated at room temperature on ITO and Mo coated glass substrates using electrodeposition route, followed by a sulfurization treatment. We investigated the effect of the substrates on crystallographic structure, morphology, composition and optical properties of electrodeposited CZTS thin films. X-ray diffraction and Raman analysis showed that the deposited films were polycrystalline with kesterite structure. Film composition and surface morphology have been analyzed using Scanning electron microscopy and Energy dispersive analysis. Photoluminescence spectroscopy showed for both films a broad PL band centered around 1.5 eV.

Study of sprayed CZTS thin films containing various copper content

By ultrasonic spray, we have deposited CZTS films on Mo coated substrates. A sulfurization treatment was systematically performed under Argon atmosphere at 500 °C for one hour. Copper content effect of CZTS thin films of about 1 µm was studied by X-ray diffraction, Raman spectroscopy and optical transmittance measurements. The films exhibited the kesterite structure despite the appearance of some secondary phases for a high and poor copper content. The gap energy value was sensitive to the copper content and ranged between 1.42 eV and 1.68 eV.

Electrochemical Lithium and sodium insertion from aqueous solutions into TiO 2 films deposited on stainless steel

Nanostructured titanium oxide thin films were fabricated directly by an anodic electrodeposition using an aqueous TiCl3 solution. Structure and morphology of thin layers of TiO2 deposited on stainless steel and annealed at different temperatures were characterized by X-ray diffraction (XRD) and microscopy techniques (SEM, AFM). Two phases of titanium oxide observed at annealing temperature 350 °C (rutile and anatase) converts after annealing at 450 °C into anatase well-crystallized phase. The grain size was of about 20-30 nm. By AFM analysis, roughness around 50 nm was observed. Cyclic voltammograms (CVs) showed that annealed titanium oxide films have exhibited reversible insertion/de-insertion of lithium ion and of sodium in LiOH or NaOH aqueous electrolyte.