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An investigation on electron behavior employing vertically-aligned Ti0_2 nanotube electrodes for dye-sensitized solar cells

机译：垂直取向的TiO_2纳米管电极在染料敏化太阳能电池中的电子行为研究

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Anodically grown TiO_2 nanotubes (TONTs), approximately 13 μm thick, were prepared on an ethylene glycol-based electrolyte containing 0.25 wt% NH4F with extremely small amounts of water. A Ti substrate was pretreated electrochemically, which affected the TONT surface morphology. The TONT (abbreviated as two-step TONT) grown on the pretreated substrate showed a uniform surface morphology with an interconnected nanotubular structure, while the surface morphology of the TONT (abbreviated as one-step TONT) formed on the bare substrate was quite rough. The photocurrent (8.4 mA cm~(-2)) of the two-step TONT-based dye-sensitized solar cell (DSSC) was improved by 14% compared to that (7.2 mA cm~(-2)) of the one-step TONT-based DSSC. This improvement was attributed mainly to the increased light capturing efficiency, that is, light absorbance by a dye-sensitized TONT film. The discrepancy between the increasing light capturing yield (21%) and overall photocurrent (14%) was attributed to the slower electron transport rate as a result of the large surface area and lateral movement along the three-dimensional network. Therefore, the improved photocurrent of the two-step TONT-based DSSC led to an enhancement (12.5%) of the overall power conversion efficiency.
机译：在含有0.25 wt％NH4F和极少量水的乙二醇基电解质上制备约13μm厚的阳极生长TiO_2纳米管（TONT）。钛基材经过电化学预处理，这影响了TONT表面的形貌。在预处理的基材上生长的TONT（缩写为两步TONT）显示出具有相互连接的纳米管结构的均匀表面形态，而在裸露的基材上形成的TONT（缩写为一步TONT）的表面形态则相当粗糙。两步式基于TONT的染料敏化太阳能电池（DSSC）的光电流（8.4 mA cm〜（-2））与单步TONT基染料敏化太阳能电池（7.2 mA cm〜（-2））相比提高了14％步骤基于TONT的DSSC。该改善主要归因于提高的光捕获效率，即，染料敏化的TONT膜的光吸收。由于较大的表面积和沿三维网络的横向运动，提高了光捕获率（21％）和总光电流（14％）之间的差异是由于电子传输速率较慢。因此，两步式基于TONT的DSSC的改善的光电流导致整体功率转换效率提高（12.5％）。

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