Beijing Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
Phys Chem Chem Phys. 2011 Mar 14;13(10):4659-67. doi: 10.1039/c0cp02099k. Epub 2011 Jan 31.
At present, the photovoltaic performance of quantum dot-sensitized solar cells (QDSCs) is still much lower than conventional DSCs. Appropriate porous TiO(2) photoanodes for QDSCs need to be further investigated, and optimization of the nanoparticle-based photoanodes is highly desirable as well. In this article, the influence of the structural properties of various TiO(2) photoanodes on CdS/CdSe-sensitized solar cells have been systematically studied. Quantitative analyses of light-harvesting efficiency (LHE) and electron-transfer yield (Φ(ET)) for the QDSCs are investigated for the first time. It is revealed that the LHE increases in the long wavelength region with the addition of large size TiO(2) particles to the transparent film. In the meantime, the balance between the light scattering and surface area also needs to be controlled, which can significantly restrain the dark current of the device. A double-layer photoanodic structure can give 4.92% of light-to-electricity conversion efficiency with a photoactive area of 0.15 cm(2).
目前，量子点敏化太阳能电池（QDSCs）的光伏性能仍远低于传统的 DSCs。需要进一步研究适用于 QDSCs 的多孔 TiO2 光阳极，并且高度期望优化基于纳米颗粒的光阳极。在本文中，系统研究了各种 TiO2 光阳极的结构特性对 CdS/CdSe 敏化太阳能电池的影响。首次对 QDSCs 的光捕获效率（LHE）和电子转移产率（Φ（ET））进行了定量分析。结果表明，随着大尺寸 TiO2 颗粒添加到透明膜中，长波长区域的 LHE 增加。同时，还需要控制光散射和表面积之间的平衡，这可以显著抑制器件的暗电流。双层光阳极结构可以在 0.15cm2 的光活性面积下提供 4.92%的光电转换效率。
