Abstract
Porous ZnO nanowire (NW) arrays were synthesized by a one-pot ammonium hydroxide-assisted hydrothermal method. By controlling the volume proportion between the solution and the bottle, ZnO NW arrays as long as 20 mu m have been obtained in a short duration of 8 h, indicating a high growth rate of 2.5 mu m h(-1). Further prolonging the hydrothermal reaction time to 20 h, ZnO NWs become porous, which is a key advantageous feature for ZnO NW arrays based dye-sensitized solar cells (DSSCs). By TiO2 coating and N-719 sensitizing, the power conversion efficiency of the porous ZnO NW-TiO2 based DSSC reaches 3.06%. (C) 2013 Elsevier B.V. All rights reserved.
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