CHEN Yunxia ^{1, 2}, NI Hangjian ¹, ZENG Tao ¹, SHI Wei ^{1, 2}
(1. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China; 2. National
Engineering Research Center for Domestic & Building Ceramics, Jingdezhen 333001, Jiangxi, China)

Abstract: TiO₂ nanotube arrays were fabricated by anodization of titanium foils. The as-prepared TiO₂nanotube arrays were firstly annealed at a low temperature (250 ℃). Then a low secondary anodic oxidation voltage (60 V) was applied at the bottom of the TiO₂nanotube arrays to slowly open the hole and eventually peel off the arrays film. The results show that the corresponding N719 dye-sensitized solar cell achieved a photoelectric conversion efficiency of 3.59%, which was the best output performance in the corresponding series of the controlled experiments when the time of the secondary anodization lasted for 1.5 h. After the treatment of TiCl₄, the photo-electric conversion can be greatly improved, and the conversion value by the top-surface upright method is obviously higher than that of the bottom surface upright mode. Eventually, the photoelectric conversion efficiency reached 5.11%.

Key words: open hole; TiO₂ nanotube arrays; low secondary anodic oxidation voltage; dye sensitized solar cell