Influence of the Potassium Chloride Concentration on the Physical Properties of Electrodeposited ZnO Nanowire Arrays
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Altres documents de l'autoria: Tena-Zaera, Ramón; Elias, Jamil; Lévy-Clément, Claude; Bekeny, Chegnui; Voss, Tobias; Mora-Sero, Ivan; Bisquert, Juan
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http://dx.doi.org/10.1021/jp804563a |
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Títol
Influence of the Potassium Chloride Concentration on the Physical Properties of Electrodeposited ZnO Nanowire ArraysAutoria
Data de publicació
2008Editor
American Chemical SocietyISSN
1932-7447Cita bibliogràfica
The Journal of Physical Chemistry C, 112, 42, p. 16318–16323Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://pubs.acs.org/doi/abs/10.1021/jp804563aVersió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
The structural, electrical, and optical properties of zinc oxide nanowire arrays electrodeposited from the reduction of molecular oxygen in aqueous solutions containing zinc chloride and potassium chloride are studied ... [+]
The structural, electrical, and optical properties of zinc oxide nanowire arrays electrodeposited from the reduction of molecular oxygen in aqueous solutions containing zinc chloride and potassium chloride are studied as a function of the potassium chloride concentration. The concentration is varied in a wide range (from 5 × 10−5 to 3.4 M). The evolution of the lattice parameters suggests the formation of zinc interstitials, especially for [KCl] > 1 M. The donor density of the as deposited nanowires, which was determined from electrochemical impedance spectroscopy (EIS), varies between 7 × 1018 and 4 × 1020 cm−3. Annealing in air (1 h at 450 °C) decreases the donor density to 1017−1018 cm−3, weakening the dependence on KCl concentration. The line width of the near-band-edge photoluminescence shows a correlation with the donor density. By correlating the variation of the lattice parameters, the donor density and the line width of the photoluminescence, we conclude that intrinsic defects play a dominant role. The incorporation of chlorine impurities appears to be of minor importance, but the concentration of chloride ions in the solution influences the formation of intrinsic defects by modifying the local composition of the electrolyte around the nanowires. [-]
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