期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 10, 期 12, 页码 1835-1838出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2008.09.029
关键词
Titanium oxide; Self-organized nanotubes; Structural disorder; Grass bundle; Anodic oxidation; Dye-sensitized solar cells
资金
- FP6
- DFG
Conventional growth of anodic TiO2 nanotubes with length of several 10 mu m typically leads to an irregular outermost surface due to chemical etching of the oxide tubes during extended exposure to a fluoride containing electrolyte. This results in an undesired and undefined morphology with a bundled nanograss appearance at the tube top. In the present work, we demonstrate a simple approach how to prevent this effect. On optimally pretreated surfaces thin rutile-type oxide layers can be formed in the initial stage of anodization. These layers can in the subsequent tube growth process efficiently protect the tube tops and thus allow the growth of nanotube layers with highly ordered and defined morphology. This improved disorder- and nanograss-free tubes show significantly increased photocurrents and conversion efficiencies in dye-sensitized solar cells. (C) 2008 Elsevier B.V. All rights reserved.
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