Thiophene-nitroxide radical as a novel combination of sensitizer-redox mediator for dye-sensitized solar cells

被引：19
作者：
Lee, Jun Young [4 ]
Lee, Chongchan [5 ]
Lee, Yong Min [6 ]
Cho, Kuk Young [2 ,3 ]
Choi, Jang Wook [1 ]
Park, Jung-Ki [1 ,4 ]
机构：
[1] Korea Adv Inst Sci & Technol, Grad Sch EEWS, Taejon 305701, South Korea
[2] Kongju Natl Univ, Div Adv Mat Engn, Cheonan 331717, Chungnam, South Korea
[3] Kongju Natl Univ, Inst Rare Met, Cheonan 331717, Chungnam, South Korea
[4] Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Grad Program BK21, Taejon 305701, South Korea
[5] Dongjin Semichem Co Ltd, R&D Ctr, Whasung Si 445931, Gyeonggi Do, South Korea
[6] Hanbat Natl Univ, Dept Appl Chem, Taejon 305719, South Korea
来源：
JOURNAL OF SOLID STATE ELECTROCHEMISTRY | 2012年 / 16卷 / 02期
基金：
新加坡国家研究基金会;
关键词：
Nitroxide; Thiophene dye; Redox mediator; Open-circuit voltage; Dye-sensitized solar cell; PHOTOVOLTAIC CELLS; EFFICIENT; ELECTROLYTE; TRANSPORT; KINETICS;
D O I：
10.1007/s10008-011-1405-9
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
We report a novel combination of organic sensitizer and redox mediator in the electrolyte for dye-sensitized solar cells (DSSCs): a thiophene dye and nitroxide radicals. Nitroxide radicals and their oxidized counterparts of oxoammonium cations show robust reversible redox reactions, thus supporting robust DSSC operations. Moreover, their redox potentials (E-1/2) and thus open-circuit voltages (V-OC) can be tuned further by attached functional groups. Optical and electrochemical characterization reveal that these new combinations exhibit enhanced V-OC and power conversion efficiencies compared to the existing iodine mediator (I-/I-3(-)) due to the increased V-OC. Also, the selection of the sensitizer-redox mediator turns out to be critical in the overall cell performance. Indeed, the typical ruthenium dye loses its light absorption capability when it is operated in conjunction with the nitroxide radicals.
引用
收藏
页码：657 / 663
页数：7
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