Controlled Oriented Attachment of Bipyramidal-Shaped Anatase TiO2 and Their Enhanced Performance in Dye-Sensitized Solar Cells.
Controlled Oriented Attachment of Bipyramidal-Shaped Anatase TiO2 and Their Enhanced Performance in Dye-Sensitized Solar Cells.
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DOI：
10.1002/cplu.201402449
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发表时间：
2015-05
期刊：
影响因子：
3.4
通讯作者：
Shuang Yang;Y. Zheng;Yu Hou;H. Yang
中科院分区：
文献类型：
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作者：
Shuang Yang;Y. Zheng;Yu Hou;H. Yang
采用低成本水热法合成了高纯度(101)晶面包覆的高纯双锥状二氧化钛单晶。可以通过微调反应温度来控制定向附着行为。这在决定晶体沿[001]方向生长的过程中起到了重要作用，导致了双金字塔晶体在不损失比表面积的情况下自组装成连通的单晶纳米棒。此外，还研究了这种锐钛矿型二氧化钛纳米晶在DSCS光阳极中的定向附着与光伏性能的关系。高度取向的样品达到了最大的总能量转换效率8.63%。这些结果进一步说明，高度取向的样品具有优越的电荷传输能力，这源于增强的长程原子排列，减少了晶界，并具有类似的染料分子吸收。
A low-cost hydrothermal method was used to synthesize high-purity bipyramidal single-crystals of TiO2 enclosed with high percentage of (101) facets. The oriented attachment behavior can be controlled by fine tuning the reaction temperature. This played an important role in determining the crystal growth along [001] direction resulting in the self-assembly of the bipyramid crystals into connected ones to form single-crystal nanrods without the loss of surface area. In addition, the relationship between oriented attachment and the photovoltaic performance of such anatase TiO2 nanocrystals in photoanodes of DSCs was investigated. The highly oriented sample reached a maximum overall energy conversion efficiency of 8.63 %. These results further illustrated that the highly oriented samples have superior charge transport ability derived from the enhanced long-range atomic arrangement with reduced grain boundaries and comparable uptake of dye molecules.