A double layered photoanode made of highly crystalline TiO2 nanooctahedra and agglutinated mesoporous TiO2 microspheres for high efficiency dye sensitized solar cells
A double layered photoanode made of highly crystalline TiO2 nanooctahedra and agglutinated mesoporous TiO2 microspheres for high efficiency dye sensitized solar cells
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DOI：
10.1039/c1ee01071a
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发表时间：
2011-06
影响因子：
32.5
通讯作者：
Keyou Yan;Yongcai Qiu;Wei Chen;Min Zhang;Shihe Yang
中科院分区：
文献类型：
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作者：
Keyou Yan;Yongcai Qiu;Wei Chen;Min Zhang;Shihe Yang
我们报道了一种新型的双层光阳极染料敏化太阳能电池的高度结晶的TiO 2八面体纳米晶体和凝集的介孔TiO 2微球。纳米八面体的底层用作透明的光阳极，用于在光滑的（101）表面上的大量和强的染料吸附以及用于促进电子传输。虽然纳米八面体非常小，但我们的合成路线确保了具有锋利边缘和光滑表面的多面晶体形状，从而获得了7.61%的功率转换效率，远高于P25（5.76%）。另外，分层TiO 2介孔微球的覆盖层起着有效的光散射，染料吸收和电解质渗透的多重作用。特别值得注意的是通过我们的3D颈缩过程的微球的凝集，其产生的电子扩散系数是P25网络的五倍，是纳米八面体网络的四倍。这是DSSC中的重大突破，其确保覆盖层中的光生电子可以有效地通过这种高速公路状路径传输并最终在FTO电极处收集。因此，在这种双层光电阳极中，我们考虑了许多不同的因素，旨在提高DSSC的整体性能。利用材料合成和纳米结构和界面工程的明智组合，基于这种双层结构的太阳能电池即使采用简单的器件制造程序也实现了8.72%的功率转换效率，显示出作为高效染料敏化太阳能电池的新型光电阳极设计的前景。
We report the development of a novel double layered photoanode for dye sensitized solar cells made of highly crystalline TiO2 octahedral nanocrystals and agglutinated mesoporous TiO2 microspheres. The underlayer of nanooctahedra serves as a transparent photoanode for copious and strong dye adsorption on the smooth (101) surfaces and for facilitated electron transport. Although the nanooctahedra are extremely small, our synthetic route has ensured a well-faceted crystalline shape with sharp edges and smooth surfaces, resulting in a 7.61% power conversion efficiency, much higher than that of P25 (5.76%). Separately, the overlayer of hierarchical TiO2 mesoporous microspheres plays the multiple roles of efficient light scattering, dye absorption and electrolyte permeation. Especially noteworthy is the agglutination of the microspheres through our 3D necking process, which has yielded an electron diffusion coefficient five times that of the P25 network and four times that of the nanooctahedra network. This is a significant breakthrough in DSSCs, which ensures that the photogenerated electrons in the overlayer can be effectively transported through such highway-like paths and ultimately collected at the FTO electrode. Therefore, in this double layered photoanode we have taken into consideration a number of disparate factors aimed at enhancing the overall DSSC performance. Drawing on the judicious combination of materials synthesis and engineering of nano-architectures and interfaces, solar cells based on this double layered structure have achieved 8.72% power conversion efficiency even with simple device fabrication procedures, showing promise as a new photoanode design for high efficiency dye sensitized solar cells.