Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science, 12-1, Ichigaya-Funagawara, Shinjuku, Tokyo, 162-0826 (Japan), Fax: (+08) 3 5261 4631.
Chemphyschem. 2014 Apr 14;15(6):1201-6. doi: 10.1002/cphc.201301025. Epub 2014 Jan 31.
Dependence of the suppression of the backward electron transfer reaction from the TiO2 photoelectrode to I3(-) 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.
为了进一步提高高性能共敏化染料敏化太阳能电池（DSC）的效率，研究了电解质中 TiO2 光电阴极到 I3(-) 的向后电子转移反应的抑制对季铵阳离子烷基链长度的依赖性。研究发现，四庚基铵阳离子比四乙基铵和四丁基铵阳离子更有效，可抑制向后电子转移反应，而不会改变 TiO2 的导带能量。在使用含有中等浓度四庚基碘化铵的电解质溶液的共敏化 DSC 中，使用 Black 染料和 D131，获得了 12.0%的转换效率，这是基于钌敏化剂的 DSC 的第二高效率。
