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https://hdl.handle.net/20.500.11888/6225

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Browsing Conferences and Workshops by Subject "Annealing"

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    Modification of CuSe Thin Film Electrodes Prepared by Electrodeposition: Enhancement of Photoelectrochemical Characteristics by Controlling Cooling Rate and Covering with Polymer/Metalloporphyri
    (2015-04-21) Al-Kerm, Rola Sultan
    CuSe thin films were prepared on FTO/glass using electrodeposition technique for the purpose of photoelectrochemical (PEC) conversion of light into electricity. Effects of annealing temperature, cooling rate, deposition time, annealing time, and coating with MnP-PE matrix on the film characteristics were investigated for different films using different techniques: AFM, PL spectra, UV-Visible spectra.PEC parameters including: dark J-V plots, photo J-V plots, value of short-circuit current, open circuit potential and stability, have also been studied. Coating the preannealed CuSe thin films significantly enhanced their physical properties and PEC characteristics. Moreover, pre-annealing the coated CuSe films with MnP-PE matrix for 2 hrs gave highest conversion efficiency and fill factor (14.3%, 77.4% respectively). This study has come out with a major finding and recommendation that is: Pre-annealing CuSe film electrodes at certain temperature (150oC) for 2 hrs followed by coating with suitable electroactive matrix MnP/PE significantly enhanced their physical properties and PEC characteristics.
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    Modifying PEC Characteristics of CuS Thin Film Electrodes Prepared by Electrodeposition: Effect of Cooling Rate and Coverage With Electroactive Composite Materials
    (2015-04-21) Al-Kerm, Rana Sultan
    Binary compound semiconductors of CuS were grown on FTO/glass substrates by electrodeposition method. The prepared films were then covered with tetra(-4pyridyl)porphyrinatomanganese(II/III) sulfate (MnIIMTPyP & MnIII TPyP) embedded into a polyethylene polymer matrix. The covered films were annealed under nitrogen and used for a photoelectrochemical study in aqueous electrolyte solutions for the first time. Effects of pre-annealing temperature (150, 250 and 350oC), cooling rate, annealing time, and using different aqueous electrolytic systems, on the covered thin film electrodes characteristics have been studied. Photolumenescence spectra, electronic absorption spectra, dark J-V plots, photo J-V plots, conversion efficiency and value of short-circuit current, for the prepared electrodes, have also been studied. The modified electrode surfaces were more stable to degradation in the dark and under illumination than the unmodified ones. Furthermore, the modified electrodes showed higher light-to-electricity conversion efficiency than the unmodified ones. Based on this study, it is strongly recommended to pre-anneal CuS films and cover them with MnP/PE matrices before using them in PEC processes.