Dependence of the Efficiency Improvement of Black-DyeBased Dye-Sensitized Solar Cells on Alkyl Chain Length of Quaternary Ammonium Cations in Electrolyte Solutions

被引:45
作者
Ozawa, Hironobu [1 ]
Okuyama, Yu [1 ]
Arakawa, Hironori [1 ]
机构
[1] Tokyo Univ Sci, Fac Engn, Dept Ind Chem, Shinjuku Ku, Tokyo 1620826, Japan
关键词
electron transfer; energy conversion; photochemistry; ruthenium; sensitizers; BAND-EDGE MOVEMENT; CONVERSION EFFICIENCY; CHARGE RECOMBINATION; PERFORMANCE;
D O I
10.1002/cphc.201301025
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
Dependence of the suppression of the backward electron transfer reaction from the TiO2 photoelectrode to I-3(-) in the electrolyte on the alkyl chain length of the quaternary ammonium cation has been investigated for further efficiency improvement of high-performance cosensitized dye-sensitized solar cells (DSCs). The tetraheptylammonium cation was found to be more effective than the tetraethylammonium and tetrabutylammonium cations for the suppression of the backward electron transfer reaction without changing the conduction band energy of TiO2. 12.0% conversion efficiency, which is the second highest efficiency for DSCs based on ruthenium sensitizers, was achieved in the cosensitized DSC with Black dye and D131 by using an electrolyte solution containing a moderate concentration of tetraheptylammonium iodide.
引用
收藏
页码:1201 / 1206
页数:6
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