Zhao Yong, Sheng Xianliang, Zhai Jin, Jiang Lei, Yang Chunhe, Sun Zhongwei, Li Yongfang, Zhu Daoben
Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, P. R. China.
Chemphyschem. 2007 Apr 23;8(6):856-61. doi: 10.1002/cphc.200600664.
Titanium dioxide (TiO(2)) photoelectrodes with micro/nano hierarchical branched inner channels have been prepared by an electrohydrodynamic (EHD) technique and assembled to form dye-sensitized solar cells (DSSCs). Excellent penetration of ionic-liquid electrolytes and enhanced light harvesting in the longer wavelength region are realized within the composite-structure electrode, thus a better fill factor (ff) of 75.3 % and higher conversion efficiency (eta) of 7.1 % are obtained for viscous ionic-liquid electrolytes compared to pure nanostructured films. Hierarchical branched channels in the photoanodes can efficiently improve the transport properties of redox-active species in viscous electrolytes, which is demonstrated by electrical impedance spectroscopy (EIS). The incident monochromatic photon-to-electron conversion efficiency (IPCE) shows that enhanced light scattering in the composite film is of benefit for light harvesting and thus for solar energy conversion efficiency.
采用电流体动力学（EHD）技术制备了具有微/纳分级分支内通道的二氧化钛（TiO₂）光电极，并将其组装成染料敏化太阳能电池（DSSC）。在复合结构电极中实现了离子液体电解质的优异渗透以及在较长波长区域内增强的光捕获，因此与纯纳米结构薄膜相比，粘性离子液体电解质获得了75.3%的更好填充因子（ff）和7.1%的更高转换效率（η）。光阳极中的分级分支通道可以有效改善粘性电解质中氧化还原活性物种的传输特性，这通过电化学阻抗谱（EIS）得到了证明。入射单色光子到电子转换效率（IPCE）表明，复合薄膜中增强的光散射有利于光捕获，从而有利于太阳能转换效率。
