High efficiency dye-sensitized solar cells based on hierarchically structured nanotubes

Meidan Ye, Xukai Xin, Changjian Lin, Zhiqun Lin

Research output: Contribution to journalArticlepeer-review

337 Scopus citations


Dye-sensitized solar cells (DSSCs) based on hierarchically structured TiO2 nanotubes prepared by a facile combination of two-step electrochemical anodization with a hydrothermal process exhibited remarkable performance. Vertically oriented, smooth TiO2 nanotube arrays fabricated by a two-step anodic oxidation were subjected to hydrothermal treatment, thereby creating advantageous roughness on the TiO2 nanotube surface (i.e., forming hierarchically structured nanotube arrays-nanoscopic tubes composed of a large number of nanoparticles on the surface) that led to an increased dye loading. Subsequently, these nanotubes were exploited to produce DSSCs in a backside illumination mode, yielding a significantly high power conversion efficiency, of 7.12%, which was further increased to 7.75% upon exposure to O2 plasma.

Original languageEnglish
Pages (from-to)3214-3220
Number of pages7
JournalNano Letters
Issue number8
StatePublished - 10 Aug 2011


  • dye-sensitized solar cells
  • hydrothermal treatment
  • rough surface
  • TiO nanotubes
  • two-step anodization


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