Densely aligned rutile TiO2 nanorod arrays with high surface area for efficient dye-sensitized solar cells
Densely aligned rutile TiO2 nanorod arrays with high surface area for efficient dye-sensitized solar cells
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DOI：
10.1039/c2nr31431b
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发表时间：
2012-01-01
期刊：
影响因子：
6.7
通讯作者：
Lin, Changjian
中科院分区：
文献类型：
--
作者：
Lv, Miaoqiang;Zheng, Dajiang;Lin, Changjian
具有大内表面积的一维（1-D）TiO 2纳米棒阵列（NRA）在染料敏化太阳能电池（DSSC）中是期望的。到目前为止，基于一维金红石TiO 2纳米结构的DSSC的良好性能仍然是一个挑战，主要是由于它们的染料负载能力低，导致一维TiO 2纳米结构的比表面积不足。本文采用水热法在掺氟氧化锡（FTO）透明导电衬底上直接制备了厚度可调的TiO 2纳米粒子，并通过化学刻蚀的方法进一步提高了TiO 2纳米粒子的比表面积。刻蚀处理导致二氧化钛纳米棒分裂成直径减小的二级纳米棒，这显著地增大了二氧化钛纳米棒的内表面积。在刻蚀后的TiO 2薄膜中也观察到了一维金红石型TiO 2纳米管阵列的形成。最后，通过利用蚀刻的TiO 2 NRA作为光阳极实现了5.94%的DSSC效率，这是迄今为止报道的1-D金红石TiO 2 NRA膜的最佳DSSC效率。
One-dimensional (1-D) TiO2 nanorod arrays (NRAs) with large inner surface area are desired in dyesensitized solar cells (DSSCs). So far, good performance of DSSCs based on 1-D rutile TiO2 NRAs remains a challenge mainly owing to their low dye-loading ability resulting from the insufficient specific surface area of 1-D TiO2 nanostructures. In this paper, densely aligned TiO2 NRAs with tunable thickness were grown directly on transparent conductive fluorine-doped tin oxide (FTO) substrates by hydrothermal method, followed by a facile chemical etching route to further increase the specific surface area of the TiO2 NRAs. The etching treatment leads to the split of TiO2 nanorods into secondary nanorods with a reduced diameter, which markedly enlarges the inner surface area of the TiO2 NRAs. The formation of 1-D rutile TiO2 nanotube arrays (NTAs) is observed as well in the etched TiO2 films. Finally, a DSSC efficiency of 5.94% was achieved by utilizing an etched TiO2 NRA as the photoanode, which is so far the best DSSC efficiency that has been reported for the 1-D rutile TiO2 NRA films.