Cyclometalated Ruthenium Sensitizers Bearing a Triphenylamino Group for p-Type NiO Dye-Sensitized Solar Cells
Cyclometalated Ruthenium Sensitizers Bearing a Triphenylamino Group for p-Type NiO Dye-Sensitized Solar Cells
复制标题
DOI：
10.1021/am402263q
复制
发表时间：
2013-09-11
影响因子：
9.5
通讯作者：
Wu, Yiying
中科院分区：
文献类型：
--
作者：
Ji, Zhiqiang;Natu, Gaytri;Wu, Yiying
我们报道了一系列带有三苯基氨基连接基的环化钌敏化剂的合成、物理化学和电化学研究。这些钌敏化剂的一般结构是Ru[（NN）-N-boolean AND]（2）[（NC）-C-boolean AND]，其中[（NN）-N-boolean AND]是二亚胺配体，[（NC）-C-boolean AND]是环化配体。三苯氨基基团连接到[（NC）-C-boolean AND]配体的碳-碳键的-帕拉，作为连接体，以桥接钌发色团和NiO表面，并增强空穴注入的电子耦合。因此，用这些敏化剂制成的细胞产生比用我们的具有亚苯基连接体的现有敏化剂敏化的细胞更高的短路电流（J（sc））。此外，（NN）-N-布尔AND配体被系统地从2，2 '-联吡啶（O3）调谐到1，10-菲咯啉（O 13）和红菲咯啉（O 17）。随着系列的增加，NN配体的共轭增加，导致消光系数增加，光吸收红移。然而，用O3敏化的太阳能电池仍然给出3.04mA/cm（2）的最大J（sc）。大的J（sc）突出了使用这些环化钌敏化剂用于NiO DSSC的有希望的潜力。此外，还通过强度调制光电压谱（IMVS）和强度系统地研究了这些太阳能电池的载流子动力学。调制光电流光谱（IMPS）。结果表明，O3太阳能电池给出最大的J（sc）可能是由于缓慢的成对电荷复合和有效的染料再生。
We report the synthesis, photophysical, and electrochemical studies of a series of cyclometalated ruthenium sensitizers carrying triphenylamino linkers for p-type NiO dye-sensitized solar cells (DSSCs). The general structure of these ruthenium sensitizers is Ru[(NN)-N-boolean AND](2)[(NC)-C-boolean AND], where [(NN)-N-boolean AND] is a diimine ligand and [(NC)-C-boolean AND] is a cyclometalated ligand. The triphenylamino group is attached to the -para position of the ruthenium-carbon bond of the [(NC)-C-boolean AND] ligand as a linker to bridge the ruthenium chromophore and the NiO surface and to enhance the electronic coupling for hole injection. As a result, cells made with these sensitizers generate higher short-circuit currents (J(sc)) than cells sensitized with our prior sensitizers with phenylene linkers. Morever the (NN)-N-boolean AND ligands are systematically tuned from 2,2'-bipyridine (O3), to 1,10-phenanthroline (O13), and to bathophenanthroline (O17). Following the series, the conjugation of the NN ligand is increased, which results in the enhancement of extinction coefficient and the red shift of light absorption. However the solar cell sensitized with O3 still gives the largest J(sc) of 3.04 mA/cm(2). The large J(sc) highlights the promising potential of using these cyclometalated ruthenium sensitizers for NiO DSSCs. In addition, the carrier dynamics of these solar cells has been systematically studied by intensity-modulated photovoltage spectroscopy (IMVS) and intensity. modulated photocurrent spectroscopy (IMPS). The results suggest that the O3 solar cell giving the largest J(sc) is likely caused by the slow geminate charge recombination and efficient dye regeneration.