Resonance Raman scattering of a dye-sensitized solar cell: Mechanism of thiocyanato ligand exchange

被引:157
作者
Greijer, H
Lindgren, J
Hagfeldt, A
机构
[1] Uppsala Univ, Dept Phys Chem, SE-75121 Uppsala, Sweden
[2] Uppsala Univ, Dept Mat Chem, Angstrom Lab, SE-75121 Uppsala, Sweden
关键词
D O I
10.1021/jp011062u
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A method has been developed to study the mechanisms of the thiocyanato ligand exchange reactions between the redox couple I(-)/I(3)(-) and the ruthenium complex bis(tetrabutylammonium) cis-bis(thiocyanato)bis(2,2 ' -bipyridine-4-carboxylic acid, 4 ' -carboxylate)ruthenium(II), in a sealed dye-sensitized solar cell using resonance Raman scattering. Raman lines from the solar cell were assigned to vibrations from the different constituents. In a cell with only lithium iodide added to the solvent, the formation of triiodide was observed at 114 and 226 cm(-1). The amount of thiocyanato group coordinated to the dye, estimated from the CN stretching observed at 2105 cm(-1), decreased with the increased amount of iodine added or triiodide formed in the electrolyte. It was shown that the thiocyanato ligands formed a complex with iodine, I(2)SCN(-), indicated by a weak Raman line at 165 cm(-1). From UV-vis measurement, the dye after the SCN(-) loss is proposed to be a cis-bis(iodo)bis(2,2 ' -bipyridine-4-carboxylic acid, 4 ' -carboxylate)ruthenium(II) complex. It is suggested that the electrolyte additive 4-tert-butylpyridine suppresses the loss of the thiocyanato group from the dye.
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页码:6314 / 6320
页数:7
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