An organic redox mediator for dye-sensitized solar cells with near unity quantum efficiency

被引：59
作者：
Liu, Yeru [1 ]
Jennings, James R. [1 ]
Parameswaran, Manoj [1 ]
Wang, Qing [1 ]
机构：
[1] Natl Univ Singapore, Dept Mat Sci & Engn, Fac Engn, NUSNNI Nanocore, Singapore 117574, Singapore
来源：
ENERGY & ENVIRONMENTAL SCIENCE | 2011年 / 4卷 / 02期
关键词：
ELECTRON-TRANSFER MEDIATORS; CONVERSION EFFICIENCY; ACID-SOLUTIONS; THIN-LAYER; ELECTROOXIDATION; REGENERATION; COMPLEXES; THIOUREAS; TRANSPORT; FTIRRAS;
D O I：
10.1039/c0ee00519c
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The organic redox mediator tetramethylformaminium disulfide/tetramethylthiourea was evaluated in dye-sensitized nanocrystalline TiO2 solar cells, as an alternative to the conventional I-3(-)/I- redox couple. Devices were optimized by judicious variation of electrolyte composition and selection of sensitizing dye. The best performance of the dye-sensitized solar cells incorporating this redox mediator was achieved by using a metal-free indoline-based sensitizer (D131). It was found that conventional ruthenium based sensitizers (e.g. Z907) exhibited inferior performance, possibly as a result of an insufficient driving force for sensitizer regeneration. A near unity incident photon-to-collected-electron conversion efficiency was achieved at low light intensity for optimized devices. The overall light-to-electric power conversion efficiency under AM 1.5 1 Sun illumination reached 3.88%. This represents an increase of ca. 25% compared with previously reported DSCs using this redox mediator. Factors limiting cell performance were further investigated using transient absorption spectroscopy and electrochemical impedance spectroscopy.
引用
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页码：564 / 571
页数：8
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