MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, Lehn Institute of Functional Materials, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275 (P.R. China).
Angew Chem Int Ed Engl. 2014 May 5;53(19):4816-21. doi: 10.1002/anie.201402371. Epub 2014 Mar 26.
Light-harvesting and charge collection have attracted increasing attention in the domain of photovoltaic cells, and can be facilitated dramatically by appropriate design of a photonic nanostructure. However, the applicability of current light-harvesting photoanode materials with single component and/or morphology (such as, particles, spheres, wires, sheets) is still limited by drawbacks such as insufficient electron-hole separation and/or light-trapping. Herein, we introduce a universal method to prepare hierarchical assembly of macroporous material-nanowire coated homogenous or heterogeneous metal oxide composite electrodes (TiO2 -TiO2 , SnO2 -TiO2 , and Zn2 SnO4 -TiO2 ; homogenous refers to a material in which the nanowire and the macroporous material have the same composition, i.e. both are TiO2 . Heterogeneous refers to a material in which the nanowires and the macroporous material have different compositions). The dye-sensitized solar cell based on a TiO2 -macroporous material-TiO2 -nanowire homogenous composition electrode shows an impressive conversion efficiency of 9.51 %, which is much higher than that of pure macroporous material-based photoelectrodes to date.
在光伏电池领域，光捕获和电荷收集受到了越来越多的关注，通过适当的光子纳米结构设计，可以显著促进这两个过程。然而，目前具有单一成分和/或形态的光捕获光阳极材料（如颗粒、球体、线、片）的适用性仍然受到电子-空穴分离和/或光捕获不足等缺点的限制。在此，我们介绍了一种通用的方法来制备大孔材料-纳米线涂覆的均匀或非均匀金属氧化物复合电极的分级组装（TiO2-TiO2、SnO2-TiO2 和 Zn2SnO4-TiO2；均匀是指纳米线和大孔材料具有相同的组成，即都是 TiO2。非均匀是指纳米线和大孔材料具有不同的组成）。基于 TiO2-大孔材料-TiO2-纳米线均匀组成电极的染料敏化太阳能电池表现出令人印象深刻的 9.51%的转换效率，远高于迄今为止基于纯大孔材料的光电管。
