Hydroxamate Anchors for Improved Photoconversion in Dye-Sensitized Solar Cells
Hydroxamate Anchors for Improved Photoconversion in Dye-Sensitized Solar Cells
复制标题
DOI：
10.1021/ic4010856
复制
发表时间：
2013-06-03
影响因子：
4.6
通讯作者：
Crabtree, Robert H.
中科院分区：
文献类型：
--
作者：
Brewster, Timothy P.;Konezny, Steven J.;Crabtree, Robert H.
我们提出了第一次分析的性能相比，羧酸酯和膦酸酯基团的异羟肟酸酯连接剂锚定时，在染料敏化太阳能电池（DSSC）的二氧化钛表面的聚吡咯基染料。该研究提供了对细胞性能至关重要的结构/功能关系的基本见解。我们的DSSC已通过使用新合成的染料分子，其特征在于结合实验电流密度-电压（J-V）特性曲线的测量和模拟。我们表明，锚定基团的选择对整体阳光-电力转换效率（eta）有直接影响，其中异羟肟酸锚表现出最好的性能。基于吡啶基-异羟肟酸络合物的太阳能电池表现出更高的效率，因为它们抑制了从光阳极到电解质的电子转移，并且具有上级光注入特性。这些发现表明，异羟肟酸锚定基团在DSSC和基于共价结合到半导体表面的分子吸附物的光催化应用中应该特别有价值。相反，类似的乙酰丙酮锚定物在类似的条件下可能发生分解，这表明在未来的应用中潜力有限。
We present the first analysis of performance of hydroxamate linkers as compared to carboxylate and phosphonate groups when anchoring ruthenium-polypyriclyl dyes to TiO2 surfaces in dye-sensitized solar cells (DSSCs). The study provides fundamental insight into structure/function relationships that are critical for cell performance. Our DSSCs have been produced by using newly synthesized dye molecules and characterized by combining measurements and simulations of experimental current density-voltage (J-V) characteristic curves. We show that the choice of anchoring group has a direct effect on the overall sunlight-to-electricity conversion efficiency (eta), with hydroxamate anchors showing the best performance. Solar cells based on the pyridyl-hydroxamate complex exhibit higher efficiency since they suppress electron transfer from the photoanode to the electrolyte and have superior photoinjection characteristics. These findings suggest that hydroxamate anchoring groups should particularly valuable in DSSCs and photocatalytic applications based on molecular adsorbates covalently bound to semiconductor surfaces In contrast, analogous acetylacetonate anchors might undergo decomposition under similar conditions suggesting limited potential in future applications.