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11 September 2007 Electrodeposition of ZnO nanowire arrays with tailored dimensions: building blocks for photoelectrochemical devices
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ZnO nanowire arrays appear as one of the most promising building blocks for photoelectrochemical devices. ZnO can be efficiently sensitized to solar light absorption by lining its surface with a solar light absorber or by doping with metal transition impurities. The particular morphology of ZnO nanowires may induce light scattering, increasing solar light absorption in the sensitizer. The electrodeposition of ZnO nanowire arrays from oxygen reduction was investigated in this work using Zn2+ precursor salts such as ZnSO4 and Zn(CH3COO)2 instead of the most frequently used ZnCl2. Important differences in the dimensions of the obtained nanowires were observed. The influence of the adsorbing behavior of Cl-, SO4- and CH3COO- anions on the growth mechanism was discussed depending of the Zn2+ precursor. The anion concentration in solution was determined not only by the zinc precursor, but also by the supporting electrolyte (NaCl, Na2SO4 and CH3COONa) concentrations. By using anions that exhibit different adsorbing properties on the different ZnO crystalline faces, a new strategy was developed to tailor the dimensions of the ZnO nanowires. The effects of nanowire length on the light scattering were investigated by optical spectroscopy. An overview of the influence of these effects on the sensitization of ZnO nanowires to solar light was presented by using ZnO/CdSe core-shell nanowires as an example.
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Ramon Tena-Zaera, Jamil Elias, and Claude Lévy-Clément "Electrodeposition of ZnO nanowire arrays with tailored dimensions: building blocks for photoelectrochemical devices", Proc. SPIE 6650, Solar Hydrogen and Nanotechnology II, 66500A (11 September 2007);

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