Self-templated synthesis of large-scale hierarchical anatase titania nanotube arrays on transparent conductive substrate for dye-sensitized solar cells |
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Authors: | Yi-Yi Liu Xin-Yu Ye Hong Chen Yu-Feng Cao Bing-Xin Lei Wei Sun Zhen-Fan Sun |
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Affiliation: | School of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, China |
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Abstract: | The large-scale hierarchical anatase titania nanotube arrays on transparent conductive substrate are fabricated via in situ conversion from anatase titania nanowire arrays. The first-step hydrothermal reaction is the growth of ultra-long anatase titania nanowire arrays, and the second-step hydrothermal reaction is the conversion of titania nanowire arrays to titania nanotube arrays modified with a large number of nanosheets. The resultant hierarchical titania nanotube array film provides a large surface area and superior light scattering ability. Dye-sensitized solar cell based on the hierarchical titania nanotube array photoanode obtains a power conversion efficiency as high as 5.96% and shows a prominent increase compared to the pristine titania nanowire array photoanode (2.12%). In addition, the most interesting result is that an optimized efficiency of 7.54% is achieved for the cell based on the hierarchical titania nanotube array photoanode with titania sol modification. |
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Keywords: | Nanowire Nanotube Titania Dye-sensitized solar cell In situ conversion |
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