Long vertically aligned titania nanotubes on transparent conducting oxide for highly efficient solar cells
Long vertically aligned titania nanotubes on transparent conducting oxide for highly efficient solar cells
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DOI：
10.1038/nnano.2009.226
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发表时间：
2009-09-01
影响因子：
38.3
通讯作者：
Grimes, Craig A.
中科院分区：
文献类型：
--
作者：
Varghese, Oomman K.;Paulose, Maggie;Grimes, Craig A.
染料敏化太阳能电池由二氧化钛纳米颗粒的随机网络组成，这些纳米颗粒既作为染料分子的高表面积载体，又作为电子传输介质。尽管实现了高功率转换效率，但它们的性能受到纳米颗粒膜中的电子捕获的限制。电子扩散长度可以通过将电荷传输通过高度有序的纳米结构如二氧化钛纳米管阵列来增加。虽然二氧化钛纳米管阵列薄膜已被证明可以提高电荷收集和光收集的效率，但不可能在透明导电氧化物玻璃上生长具有高效器件应用所需长度（数十微米）的纳米管阵列薄膜。在这里，我们报告的透明导电氧化物玻璃上的长度在0.3和33.0 μ m之间的透明二氧化钛纳米管阵列薄膜的制造使用一种新的电化学方法。含有这些阵列的染料敏化太阳能电池产生6.9%的功率转换效率。对于450和650 nm之间的波长，入射光子到电流的转换效率范围为70%至80%。
Dye-sensitized solar cells consist of a random network of titania nanoparticles that serve both as a high-surface-area support for dye molecules and as an electron-transporting medium. Despite achieving high power conversion efficiencies, their performance is limited by electron trapping in the nanoparticle film. Electron diffusion lengths can be increased by transporting charge through highly ordered nanostructures such as titania nanotube arrays. Although titania nanotube array films have been shown to enhance the efficiencies of both charge collection and light harvesting, it has not been possible to grow them on transparent conducting oxide glass with the lengths needed for high-efficiency device applications (tens of micrometres). Here, we report the fabrication of transparent titania nanotube array films on transparent conducting oxide glass with lengths between 0.3 and 33.0 mu m using a novel electrochemistry approach. Dye-sensitized solar cells containing these arrays yielded a power conversion efficiency of 6.9%. The incident photon-to-current conversion efficiency ranged from 70 to 80% for wavelengths between 450 and 650 nm.