成果報告書詳細
管理番号20140000000289
タイトル*平成25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 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 (高効率タンデム用色素材料の研究開発)
公開日2014/12/27
報告書年度2013 - 2013
委託先名新日鉄住金化学株式会社
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Our purpose is to develop tandem or cocktail, hybrid dye-sensitized solar cells with 15% efficiency by the end of 2014 fiscal year through the collaboration of Kyushu Institute of Technology (KIT) and Nippon Steel & Sumikin Chemical Co. Ltd. (NSSCC). The goal of this year is to develop near infrared dyes (IPCE is 60% at the wavelength of 800 nm) suitable for cocktail or hybrid cells made with visible dyes. We selected phthalocyanine structures as potential NIR dyes. At the beginning, we designed long-wavelengths phthalocyanine structures having a maximum absorption from 700 nm to 850 nm. Next, we controlled MO energy levels to fit TiO2 conduction band using MO calculations for the structures. MO Calculations were done for about 30 structures. Though we synthesized these phtalocyanine dyes, most of these showed poor IPCE. The reason of these poor photo electron conversion efficiency is due to aggregation of dye molecules caused by aromatic ring stacking. To avoid the aggregation, sterically hindered substituents were introduced to model compound. 2 phtalocyanines were synthesized. When sterically hindered substituents were introduced to the one, IPCE increased remarkably. On the other hand, we measured fluorescence life times of these phtalocyanine dyes. By introducing to sterically hindered substituents, the attenuation of fluorescence life times were relieved. These results suggest that the restraint of shortening of excited state lifetimes by protecting aggregation of phtalocyanine molecules causes the improvement of IPCE. On the basis of the finding, we designed and synthesized suitable NIR phtalocyanine dyes for our purposes. Adjustments of MO levels for sterically hindered phtalocyanines were also done by MO calculation. Result from MO calculation, we designed and tried to develop synthetic roots for several candidate. For synthesized compounds, comparison between HOMO calculation and work function using Phto Electron Spectroscopy in Air (PESA) is useful for further simulation adding LUMO calculation by UV-Visible spectroscopy. We synthesized 2 phtalocyanines showing UV-VIS absorption above 700 nm - 850 nm and photo electron conversion. Single cell using one phtalocyanine showed 60% IPCE at absorption maximum where IPCE curve of the cell gave higher than the curve of N719 above 770nm. We will continue to develop and modify NIR dyes and evaluate tandem or cocktail, hybrid cells with N719 in next fiscal year.
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