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Nanoscale investigation on large crystallites in TiO<sub>2</sub> nanotube arrays and implications for high-quality hybrid photodiodes

Nanoscale investigation on large crystallites in TiO2 nanotube arrays and implications for high-quality hybrid photodiodes

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WISNET, Andreas, Markus THOMANN, Jonas WEICKERT, Lukas SCHMIDT-MENDE, Christina SCHEU, 2012. Nanoscale investigation on large crystallites in TiO2 nanotube arrays and implications for high-quality hybrid photodiodes. In: Journal of Materials Science. 47(17), pp. 6459-6466. ISSN 0022-2461. eISSN 1573-4803. Available under: doi: 10.1007/s10853-012-6580-2

@article{Wisnet2012Nanos-21603, title={Nanoscale investigation on large crystallites in TiO2 nanotube arrays and implications for high-quality hybrid photodiodes}, year={2012}, doi={10.1007/s10853-012-6580-2}, number={17}, volume={47}, issn={0022-2461}, journal={Journal of Materials Science}, pages={6459--6466}, author={Wisnet, Andreas and Thomann, Markus and Weickert, Jonas and Schmidt-Mende, Lukas and Scheu, Christina} }

eng Schmidt-Mende, Lukas Journal of Materials Science ; 47 (2012), 17. - S. 6459-6466 Wisnet, Andreas Scheu, Christina Weickert, Jonas Anodized TiO<sub>2</sub> nanotube arrays fabricated on a TiO<sub>2</sub> thin film on conducting glass substrates can be readily implemented in diverse applications like hybrid solar cells. In this study, we concentrate on morphologies with inner tube diameter being around 30 nm which is in dimension of the exciton diffusion length of common organic hole conductors. Cross-sectional preparation of the intact tube array in correlation with transmission electron microscopy has been performed to get local information on the TiO<sub>2</sub> nanotubes and their arrangements, depending on anodization voltage. Crystallites have been found to be anatase and in size of several hundred nanometers along tube walls with increasing length for increasing anodization voltages. Inter-tube connections with similar crystal orientations of adjacent tubes are found. These give rise to large areas of uniform orientation. Thus, the number of grain boundaries within the film is low compared to the reported values for different TiO<sub>2</sub>-polymer material systems. Using the arrays, hybrid TiO<sub>2</sub> solar cells were fabricated, which show high fill factors indicating good electron transport. The results suggest high electron mobility and are encouraging for a utilization of the nanotube arrays in next generation photovoltaics. Schmidt-Mende, Lukas 2012 Nanoscale investigation on large crystallites in TiO<sub>2</sub> nanotube arrays and implications for high-quality hybrid photodiodes Wisnet, Andreas Weickert, Jonas Thomann, Markus 2013-02-12T09:56:12Z 2013-02-12T09:56:12Z Scheu, Christina Thomann, Markus deposit-license

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