Acta Chim. Sinica ›› 2015, Vol. 73 ›› Issue (3): 257-260.DOI: 10.6023/A14090659 Previous Articles     Next Articles

Special Issue: 新型太阳能电池



马英壮, 郑灵灵, 张立培, 陈志坚, 王树峰, 曲波, 肖立新, 龚旗煌   

  1. 北京大学物理学院 人工微结构和介观物理国家重点实验室 北京 100871
  • 投稿日期:2014-09-24 发布日期:2014-11-21
  • 通讯作者: 肖立新
  • 基金资助:

    项目受国家自然科学基金(Nos. 61177020, 11121091)资助.

A Novel Organic Disulfide/Thiolate Redox Mediator for Iodine-free Dye-sensitized Solar Cells

Ma Yingzhuang, Zheng Lingling, Zhang Lipei, Chen Zhijian, Wang Shufeng, Qu Bo, Xiao Lixin, Gong Qihuang   

  1. State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing, 100871
  • Received:2014-09-24 Published:2014-11-21
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. 61177020, 11121091).

Over the last 20 years, much attention has been paid to renewable energy technology. Photovoltaic is a promising alternative to conventional fossil fuels. Dye-sensitized solar cells (DSCs) attract notable interest, not only due to their high efficiency and environmentally friendly nature, but also their easy fabrication and relatively low manufacture costs. Despite the high efficiencies, iodine/triiodine electrolytes have some disadvantages, such as the corrosion of the metallic electrodes and the sealing materials. It also absorbs visible light around 430 nm. Therefore, it is important to exploit the iodine-free redox couple in DSCs. An organic disulfide material of 2,5-dimercapto-1,3,4-thiadiazole (DMcT) is proved here to reduce and oxidize independently via homopolymerization and depolymerization. DMcT has been applied as cathode active material for lithium rechargeable batteries. Meanwhile, the self-redox property could be used as redox mediator in lieu of iodine/triiodine electrolytes. DMcT can be oxidized by self-polymerizing into PDMcT, which can be reduced by depolymerizing back to DMcT. In contrast to the conventional redox couples consisted of two different materials, DMcT can independently act as the redox mediator, which is the main difference between DMcT and the redox couples reported previously. Dye-sensitized solar cells consist of mesoporous TiO2, N719 dye, and this novel electrolyte achieved power conversion efficiency of 1.6% under 100 mW·cm-2 simulated sunlight (AM 1.5G) and a higher efficiency of 2.6% at weak illumination (13 mW·cm-2), implying its promising application prospect. Although the conversion efficiency is relatively low to the iodine/triiodine-based DSCs, this novel single self-redox mediator provides a new promising way to the iodine-free dye-sensitized solar cells.

Key words: dye-sensitized, solar cell, organic disulfide, redox couple