Nanoforest of Hydrothermally Grown Hierarchical ZnO Nanowires for a High Efficiency Dye-Sensitized Solar Cell
Nanoforest of Hydrothermally Grown Hierarchical ZnO Nanowires for a High Efficiency Dye-Sensitized Solar Cell
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DOI：
10.1021/nl1037962
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发表时间：
2011-02-01
期刊：
影响因子：
10.8
通讯作者：
Sung, Hyung Jin
中科院分区：
文献类型：
--
作者：
Ko, Seung Hwan;Lee, Daeho;Sung, Hyung Jin
在本论文中，为了提高能量转换效率，我们展示了由高密度、长树枝状的多代层次型氧化锌纳米线光阳极组成的选择性生长的纳米森林。分枝的氧化锌纳米线的总的光转换效率几乎是由直立的氧化锌纳米线构建的直接序列干细胞的5倍。效率的提高是由于更高的染料负载量和光收集的表面积大大增加，以及通过沿着结晶的纳米树多代分支提供直接导电路径来减少电荷复合。我们进行了参数研究，以确定最佳的分层氧化锌纳米线光阳极通过长度方向生长和分支生长过程相结合。这种新的选择性分级生长方法代表了一种低成本、全溶液处理的水热方法，该方法利用种子颗粒和覆盖聚合物的简单工程来制备复杂的分级氧化锌纳米线光阳极。
In this paper, in order to increase the power conversion efficiency we demonstrated the selective growth of "nanoforest" composed of high density, long branched "treelike" multigeneration hierarchical ZnO nanowire photoanodes. The overall light-conversion efficiency of the branched ZnO nanowire DSSCs was almost 5 times higher than the efficiency of DSSCs constructed by upstanding ZnO nanowires. The efficiency increase is due to greatly enhanced surface area for higher dye loading and light harvesting, and also due to reduced charge recombination by providing direct conduction pathways along the crystalline ZnO "nanotree" multi generation branches. We performed a parametric study to determine optimum hierarchical ZnO nanowire photoanodes through the combination of both length wise growth and branched growth processes. The novel selective hierarchical growth approach represents a low cost, all solution processed hydrothermal method that yields complex hierarchical ZnO nanowire photoanodes by utilizing a simple engineering of seed particles and capping polymer.