Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 503, Issue 2, Pages L40-L43Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.05.022
Keywords
ZnO; Dumbbell-shaped nanorods; Aligned nanorods; Solution method; Dye sensitized solar cell
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Dumbbell-shaped hexagonal and well-aligned ZnO nanorod arrays (NRAs) were fabricated by simple and low temperature aqueous solution technique on ZnO-coated FTO substrate and in solution respectively. Structural analysis revealed an excellent crystal quality and wurtzite hexagonal structure of ZnO nanostructures. ZnO nanostructures were used as the wide band gap semiconducting photoelectrode in dye-sensitized solar cells (DSSCs). Well-aligned ZnO NRAs were greatly enhances dye adsorption, leading to improved light harvesting and overall efficiencies. Solar cells made from aligned ZnO NRAs showed photocurrents of 2.08 mA/cm(2), internal quantum efficiencies of 34.5%, and overall efficiencies of 0.32%. However, DSSC made from the randomly formed dumbbell-shaped hexagonal ZnO nanorods showed efficiency about 0.26%, with internal quantum efficiency of 31.5% respectively. (C) 2010 Elsevier B.V. All rights reserved.
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