Surface passivation of highly ordered TiO2 nanotube arrays and application to dye-sensitized solar cells using the concept of isoelectric point

Hun PARK; Dae-Jin YANG; Jin-Seong YOO; Kyu-Shik MUN; Woong-Rae KIM; Ho-Gi KIM; Won-Youl CHOI

doi:10.2109/jcersj2.117.596

Papers

Surface passivation of highly ordered TiO₂ nanotube arrays and application to dye-sensitized solar cells using the concept of isoelectric point

Hun PARK, Dae-Jin YANG, Jin-Seong YOO, Kyu-Shik MUN, Woong-Rae KIM, Ho-Gi KIM, Won-Youl CHOI

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Keywords: TiO₂ nanotube, Surface passivation, Anodic oxidation, Dye-sensitized solar cells, Isoelectric point

JOURNAL FREE ACCESS

2009 Volume 117 Issue 1365 Pages 596-599

DOI https://doi.org/10.2109/jcersj2.117.596

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Abstract

Highly ordered TiO₂ nanotube arrays have attracted much attention in an application to dye-sensitized solar cells (DSCs) due to their superior charge percolation. However, the efficiency of TiO₂-nanotube-based DSCs is 6.89%, which is still lower than that of TiO₂-nanoparticle-based DSCs. In this study, the surface passivation of highly ordered TiO₂ nanotube arrays has been applied to increase the performance of TiO₂-nanotube-based DSCs using the concept of isoelectric point. Both acidic oxide such as WO₃ and basic oxides such as MgO, ZnO have been used as materials for surface passivation. The overall conversion efficiency of DSCs based on surface-passivated TiO₂ nanotube arrays has been improved by these passivating layers.

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