成果報告書詳細
管理番号20140000000288
タイトル*平成25年中間年報 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 三層協調界面構築による高効率・低コスト・量産型色素増感太陽電池の研究開発 (高効率化技術及びメカニズム解析に関する研究開発)
公開日2014/12/27
報告書年度2013 - 2013
委託先名国立大学法人信州大学
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Ru complex dyes have been shown high energy conversion efficiency for dye-sensitized solar cells (DSSCs) using an I-/I3- redox couple. When metal free organic dyes are employed with the I-/I3- redox couples, the efficiency of the DSSCs was slightly lower than that of DSSCs using Ru complex dyes. When Co complex redox couples were employed with organic dyes, energy conversion efficiency was increased due to increased open circuit voltage. When Co complex redox couples were used with Ru complex dyes, the efficiency was significantly decreased. This was due to increased recombination rate between the injected electrons and the Co complex.
In this year, first we investigated why some dyes displayed very low efficiency with Co complex redox couples. We measured electron lifetime of injected electrons for DSSCs using various Ru complex and Zn porphyrin dyes with Co complex redox couples. We found that the NCS groups in Ru complex and Zn center atoms in porphyrins were the causes of the fast recombination.
To avoid the problem, we synthesized new Ru complex dyes without NSC groups and prepared solar cells with Co complex dyes. When a conventional Ru complex dye with NSC groups (black dye) was employed, the open circuit voltage and efficiency were 0.55 V and 0.6%, respectively. With the new Ru complex dyes, the values were 0.83 V and 4.6 %. As expected, large improvement was achieved. Now the thickness and porosity of the TiO2 electrodes are being optimized to improve the efficiency.
In this year, we have also tried to optimize solar cells structure with the present best organic dyes and TiO2 particles having particular facets developed in this project. However, the efficiency could not be reached to 10%. We also investigated how to facilitate reduction kinetics of dye cation and found two structures to include sensitizing dyes. In 2014, we will synthesize new dyes based on these findings.
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