成果報告書詳細
管理番号20130000000562
タイトル*平成24年度中間年報 太陽エネルギー技術研究開発 太陽光発電システム次世代高性能技術の開発 高効率・高耐久性色素増感太陽電池モジュールの研究開発(高効率・高耐久性色素増感太陽電池の基盤的研究)
公開日2015/4/25
報告書年度2012 - 2012
委託先名学校法人東京理科大学
プロジェクト番号P07015
部署名新エネルギー部
和文要約
英文要約Title: Research and development in highly efficient and durable DSC modules
Sub-title: Fundamental study on highly efficient and durable DSC
FY2012 Annual report, Tokyo University of Science

1. Contents of this R&D.
The object of this R&D is both preparation of the highly efficient modules of dye-sensitized solar cells (DSCs) and improvement of the long-term stability of DSCs for the practical application. The targets of this R&D are development of the 30cm-by-30cm DSC sub-modules exhibiting 10% conversion efficiency and achievement of the efficiency decrease within 10% after the A-1, A-2, A-5, B-1 and B-2 tests of JIS C-8938 environmental and endurance tests. In order to obtain the insights into the improvement of the efficiency of DSC sub-modules, preparation of a 1cm-by-1cm DSC showing more than 13% conversion efficiency has also been carried out. In this year, several studies have been carried out to achieve above mentioned targets.

2. Results.
(1) Studies on the improvement of the conversion efficiency of 1cm-by-1cm DSCs.
In this year, three attempts have been carried out to improve the conversion efficiency of the DSCs. First attempt is optimization of the electrolyte composition of the cosensitized DSCs with Black dye and organic dye. Especially, some kinds of counter cation of iodide have been applied to the electrolyte to suppress the backward electron transfer reaction. Second attempt is preparation of efficient TiO2 photoelectrodes by employing the nanoporous TiO2 spheres, which have larger surface areas and effective light-scattering effect compared to the TiO2 particles with the same diameter. Third attempt is surface modification of the TiO2 photoelectrodes of the cosensitized DSCs with Black dye and organic dye by insulator metal-oxide thin overlayers to suppress the backward electron transfer reaction. The conversion efficiency of the DSCs have been effectively improved by these attempts, 12.0% was obtained in 5mm-by-5mm DSC. In addition, 11.0% conversion efficiency in 1.0 cm2 size DSC was verified by AIST.

(2) Studies on the improvement of the long-term stability of DSCs.
The binding modes of previously synthesized ruthenium dyes (TUS-20 and TUS-21) at the TiO2 surface have been investigated by ATR-IR measurements because these two dyes exhibited different adsorption behavior even though each dye has ortho-dicarboxyphenyl group as an anchoring unit. In addition, novel ruthenium dye (TUS-28) having ortho-dicarboxy group as an anchoring unit has been prepared. The DSC with each dye showed 7.5% (TUS-20), 10.2% (TUS-21), and 8.6% (TUS-28) conversion efficiency.

(3) Investigation of the materials for the low-cost fabrication of DSCs.
In this study, carbon pastes made up of various mixing ratio of two kinds of carbon materials have been prepared to develop effective counter electrode. By optimizing the selection of carbon materials and the mixing ratio, 9.6% conversion efficiency was obtained in the DSCs with Pt-free counter electrode. This value is almost the same to that of the DSC with a Pt counter electrode.
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