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International Journal of Photoenergy
Volume 2012, Article ID 215802, 6 pages
http://dx.doi.org/10.1155/2012/215802
Research Article

Development of Well-Aligned TiO2 Nanotube Arrays to Improve Electron Transport in Dye-Sensitized Solar Cells

1Department of High and Advanced Science Technology, Konkuk University, Seoul 143-701, Republic of Korea
2Department of Advanced Technology Fusion, Konkuk University, Seoul 143-701, Republic of Korea
3Nanotechnology Research Center and Department of Applied Chemistry, Konkuk University, Chungju 380-701, Republic of Korea

Received 31 August 2011; Accepted 12 December 2011

Academic Editor: Stephen Bremner

Copyright © 2012 Kyung-Ho Chung et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We fabricated well-aligned one-dimensional (1-D) titania nanotubes (TNT) on transparent conducting oxide (TCO) by anodization of Ti foil. Different lengths of TNTs were prepared by varying the applied potential (70 V) time, and we investigated the performance of these TNTs in dye-sensitized solar cells (DSSCs), transplanted onto a 6 m TNP adhesion layer. The fabricated TNTs arrays (length 15 m) photoelectrode showed 24% increased efficiency compared to the TNP photoelectrode of 17 m thickness. We further investigated the performances of DSSCs for the TNTs (1 wt%) incorporated TNP photoelectrode and obtained 22% increased efficiency. The increased efficiency of the pure TNTs arrays and TNT-mixed TNP photoelectrodes was attributed to the directional electron movement of TNTs and light scattering effect of the TNT with the decreased rate of back electron transfer. The anodized and fabricated TNTs and DSSCs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), and electrochemical impedance spectroscopy (EIS).