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  Physics Express 2014, 4: 17
  Research Article
Elimination of the structural disorder from the anodized titania nanotube array for increasing the performance of dye-sensitized solar cells
  Hongmei Xua,b, Hai Wangc, Xiao Yua, Qiuyue Wanga, Yuejing Wanga, Yong Liua  
a School of Physics & Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou, 510275, China
b Guangzhou Ruxing Technology Co., Ltd. Guangzhou, 510663, China
c Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Ministry of Education, Guilin University of Technology, Guilin, 541004, China

  The oriented titania nanotube arrays are of considerable interest for use as photoanodes in dye-sensitized solar cells (DSSCs) since they can provide direct pathways for efficient charge transport and collection. However, the structural disorder usually covered the top of anodized TiO2 nanotube arrays (TNAs), which is undesired structure for DSSCs. In this study, the effects of ultrasound in combination with different mediums, such as mixture of HF and HNO3 solution, HCl solution, absolute ethanol, ethanol solution containing Al2O3 powder, and mixture of ethanol and water, were investigated to remove the structural disorder from TNAs. The results show a significant synergism between ultrasonic waves and 50 vol% ethanol aqueous solution on the elimination of the structural disorder from TNAs. An overall power conversion efficiency of 3.18% has been achieved for the disorder-free-TNAs based DSSC, which was much higher than that (2.56%) of disorder-TNAs based DSSC.
  TiO2 nanotubes; Anodic oxidation; Dye-sensitized; Solar cells  

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