Nano Archive

Use of highly-ordered TiO2 nanotube arrays in dye-sensitized solar cells

Mor, G. K. and Shankar, K and Paulose, M and Varghese, O. K. and Grimes, Craig A. (2006) Use of highly-ordered TiO2 nanotube arrays in dye-sensitized solar cells. NANO LETTERS, 6 (2). pp. 215-218.

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We describe the use of highly ordered transparent TiO2 nanotube arrays in dye-sensitized solar cells (DSCs). Highly ordered nanotube arrays of 46-nm pore diameter, 17-nm wall thickness, and 360-nm length were grown perpendicular to a fluorine-doped tin oxide-coated glass substrate by anodic oxidation of a titanium thin film. After crystallization by an oxygen anneal, the nanotube arrays are treated with TiCl4 to enhance the photogenerated current and then integrated into the DSC structure using a commercially available ruthenium-based dye. Although the negative electrode is only 360-nm-thick, under AM 1.5 illumination the generated photocurrent is 7.87 mA/cm(2), with a photocurrent efficiency of 2.9%. Voltage-decay measurements indicate that the highly ordered TiO2 nanotube arrays, in comparison to nanoparticulate systems, have superior electron lifetimes and provide excellent pathways for electron percolation. Our results indicate that remarkable photoconversion efficiencies may be obtained, possibly to the ideal limit of similar to 31% for a single photosystem scheme, with an increase of the nanotube-array length to several micrometers.

Item Type:Article
Subjects:Physical Science > Nanoelectronics
Physical Science > Photonics
ID Code:2730
Deposited By:Lesley Tobin
Deposited On:20 Jan 2009 12:54
Last Modified:26 Mar 2009 14:59

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