Interfacial Charge Transfer in Dye-Sensitized Solar Cells Using SCN-Free Terpyridine-Coordinated Ru Complex Dye and Co Complex Redox Couples
Interfacial Charge Transfer in Dye-Sensitized Solar Cells Using SCN-Free Terpyridine-Coordinated Ru Complex Dye and Co Complex Redox Couples
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DOI：
10.1021/acsami.6b03712
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发表时间：
2016-07-06
影响因子：
9.5
通讯作者：
Mori, Shogo
中科院分区：
文献类型：
--
作者：
Kono, Takahiro;Masaki, Naruhiko;Mori, Shogo
使用Ru配合物染料和Co配合物氧化还原电对的染料敏化太阳能电池（DSSC）的效率通过向染料中添加庞大或冗长的外围单元来防止电荷复合的策略而得到提高。然而，尽管做出了努力，大多数DSSC仍然遭受不统一的量子效率和快速复合。我们研究了SCN配体的作用，SCN配体已被用于许多Ru络合物染料，并可以：吸引带正电荷的Co络合物。我们发现用2，6-双（2 '-（4'-三氟甲基）吡唑基）吡啶取代配体可以提高量子效率和电子寿命。通过取代SCN配体和添加大体积部分的组合，实现了类似于80%的外量子效率。这些表明，不仅增加了阻断作用，但也减少了染料和Co络合物之间的静电和分散力是必不可少的控制电荷分离和重组过程。
The efficiency of dye-sensitized solar cells (DSSCs) using Ru complex dyes and Co complex redox couples has been increased with a strategy to prevent charge recombination via the addition of bulky or lengthy peripheral units to the dyes. However, despite the efforts, most of the DSSCs are still suffering from nonunity quantum efficiency and fast recombination. We examine the effect of SCN ligand, which has been used for many Ru complex dyes and could : attract positively charged Co complexes. We find that replacing the ligands with 2,6-bis(2'-(4'-trifluoromethyl)pyrazolyl)pyridine increases the quantum efficiency and electron lifetime. With the combination of the replacement of SCN ligands and the addition of bulky moiety, similar to 80% external quantum efficiency is achieved. These suggest that not only the addition of a blocking effect but also the reduction of electrostatic and dispersion forces between dyes and Co complexes are essential to control the charge separation and recombination processes.