Journal
RSC ADVANCES
Volume 4, Issue 15, Pages 7454-7460Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra45741a
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Funding
- Research Fund for the Doctoral Program of Higher Education of China [20120201130004]
- National Natural Science Foundation of China [61078058]
- Science, Technology Developing Project of Shaanxi Province [2012KW-11]
- Fundamental Research Funds for the Central Universities
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TiO2 nanotube arrays (TNTs) were prepared by using an electrochemical anodization method, and then the detached TNTs were successfully transferred onto a fluorine-doped tin oxide glass substrate with the help of a tetrabutyl titanate-containing sol. In order to improve the photoelectric conversion efficiency (PCE) of the as-fabricated dye-sensitized solar cells (DSSCs), an easily-operated immersing method was employed to fabricate a TiO2/ZnO nanotube array (TNT/ZnO) heterojunction, which has advantages of a high aspect ratio, low recombination rate and high absorption of visible light. The results indicate that under AM 1.5 illumination, the DSSCs based on the TNT/ZnO heterojunction exhibit a better short circuit current density (J(sc)) of 8.67 mA cm(-2) and a higher PCE of 3.98%. Electrochemical impedance spectroscopy analysis shows that the TNT/ZnO heterojunction-based DSSCs have optimized properties, such as a longer electron lifetime, lower impedance of electron transport, higher impedance of electron recombination, and electron collecting rate as high as 95.2%.
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