Department of Applied Chemistry, Tianjin University of Technology, Tianjin, 300384, PR China.
ACS Appl Mater Interfaces. 2013 Jan;5(1):144-53. doi: 10.1021/am302318z. Epub 2012 Dec 27.
Two ruthenium complexes featuring bulky ancillary ligands, XS48 and XS49, were synthesized and studied as dyes in dye-sensitized solar cells (DSCs). Both dyes exhibit higher solar-to-electrical energy conversion efficiency when compared to a commonly used N3 sensitizer under the same conditions. To examine the influence of the bulky ancillary ligands and alleviate the electron recombination in cells, we have developed a dual functioned truxene-based coadsorbent (MXD1) as an alternative candidate to chenodeoxycholic acid (CDCA). This coadsorbent not only effectively shields the back electron transfer from the TiO(2) to I(3)(-) ions but also enhances the light harvesting ability in the short wavelength regions. The photovoltaic performance of XS48-sensitized DSC was independent of the coadsorbents, while XS49 with large bulky ancillary ligand presented better performance when coadsorbent was employed. Interestingly, the simultaneous adsorption-to-sequential adsorption of XS48/49 and MXD1 has caused a notably improved photovoltage, which can be primarily ascribed to the enhanced dye adsorption and retardation of charge recombination. These results not only provide a new vision on how ancillary ligands affect the performance of ruthenium complexes but also open up a new way to achieve further efficiency enhancement of ruthenium complexes.
两种具有庞大辅助配体的钌配合物，XS48 和 XS49，被合成并作为染料在染料敏化太阳能电池（DSC）中进行了研究。与相同条件下常用的 N3 敏化剂相比，这两种染料显示出更高的太阳能到电能的能量转换效率。为了研究庞大辅助配体的影响并减轻电池中的电子复合，我们开发了一种基于三并苯的双功能共吸附剂（MXD1）作为替代胆酸（CDCA）的候选物。这种共吸附剂不仅有效地屏蔽了 TiO2 到 I3-离子的反向电子转移，而且增强了在短波长区域的光捕获能力。XS48 敏化 DSC 的光伏性能与共吸附剂无关，而当使用共吸附剂时，具有大体积庞大辅助配体的 XS49 表现出更好的性能。有趣的是，XS48/49 和 MXD1 的同时吸附-顺序吸附导致显著提高了光电压，这主要归因于增强的染料吸附和延迟了电荷复合。这些结果不仅提供了关于辅助配体如何影响钌配合物性能的新视角，而且开辟了实现进一步提高钌配合物效率的新途径。
