The main objective of this study is to show the effect of TiO 2 nanotube length, diameter and intertubular lateral spacings on the performance of back illuminated dye sensitized solar cells (DSSCs). The present study shows that processing short TiO 2 nanotubes with good lateral spacings could significantly improve the performance of back illuminated DSSCs. Vertically aligned, uniform sized diameter TiO 2 nanotube arrays of different tube lengths have been fabricated on Ti plates by a controlled anodization technique at different times of 24, 36, 48 and 72 h using ethylene glycol and ammonium fluoride as an electrolyte medium. Scanning electron microscopy (SEM) showed formation of nanotube arrays spread uniformly over a large area. X-ray diffraction (XRD) of TiO 2 nanotube layer revealed the presence of crystalline anatase phases. By employing the TiO 2 nanotube array anodized at 24 h showing a diameter ̃80 nm and length ̃1·5 μm as the photo-anode for back illuminated DSSCs, a full-sun conversion efficiency (η) of 3·5%was achieved, the highest value reported for this length of nanotubes. © Indian Academy of Sciences.
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S. V. Nair, Balakrishnan, A., Subramanian, K. R. V., Manu, A., Asha, A. M., and Deepika, B., “Effect of TiO 2 nanotube length and lateral tubular spacing on photovoltaic properties of back illuminated dye sensitized solar cell”, Bulletin of Materials Science, vol. 35, pp. 489-493, 2012.