Send to

Choose Destination
See comment in PubMed Commons below
Nanotechnology. 2009 Sep 2;20(35):355307. doi: 10.1088/0957-4484/20/35/355307. Epub 2009 Aug 11.

An investigation on electron behavior employing vertically-aligned TiO2 nanotube electrodes for dye-sensitized solar cells.

Author information

  • 1Interdisciplinary Program in Nano Science and Technology, Seoul National University, Seoul, Korea.


Anodically grown TiO(2) nanotubes (TONTs), approximately 13 microm thick, were prepared on an ethylene glycol-based electrolyte containing 0.25 wt% NH(4)F with extremely small amounts of water. A Ti substrate was pretreated electrochemically, which affected the TONT surface morphology. The TONT (abbreviated as two-step TONT) grown on the pretreated substrate showed a uniform surface morphology with an interconnected nanotubular structure, while the surface morphology of the TONT (abbreviated as one-step TONT) formed on the bare substrate was quite rough. The photocurrent (8.4 mA cm(-2)) of the two-step TONT-based dye-sensitized solar cell (DSSC) was improved by 14% compared to that (7.2 mA cm(-2)) of the one-step TONT-based DSSC. This improvement was attributed mainly to the increased light capturing efficiency, that is, light absorbance by a dye-sensitized TONT film. The discrepancy between the increasing light capturing yield (21%) and overall photocurrent (14%) was attributed to the slower electron transport rate as a result of the large surface area and lateral movement along the three-dimensional network. Therefore, the improved photocurrent of the two-step TONT-based DSSC led to an enhancement (12.5%) of the overall power conversion efficiency.

PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for IOP Publishing Ltd.
    Loading ...
    Write to the Help Desk