成果報告書詳細
管理番号20140000000291
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技術開発 (高効率・高耐久性色素材料の研究開発)
公開日2015/2/19
報告書年度2013 - 2013
委託先名富士フイルム株式会社
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1. Development of highly efficient sensitizing dyes
To improve power conversion efficiency of dye sensitizing solar cells by designing new dyes, the trade-off between short circuit current density (Jsc) and open circuit voltage (Voc) due to lower HOMO-LUMO band gaps has been a serious problem. This year, we have developed a group of new panchromatic ruthenium sensitizers, FSD-40, FSD-44, and FSD-67, which demonstrate higher Jsc and higher Voc at the same time. The cells with these dyes show an improved shape of incident photon-to-electron conversion efficiency (IPCE) spectrum in the region from 400nm to 500nm and give a lower level of dark current. We also have developed a new series of ruthenium sensitizers with longer wavelength absorption, which enables very efficient sensitization over the whole visible range extending to the near-IR region. FSD-60, FSD-68, and FSD-76 have an on set of IPCE at around 930nm that is 50nm longer than that of FSD-19. These dyes still maintain a Voc as high as that for FSD-19. Although the Jsc of these dyes has improved in comparison to FSD-19, however, the extent of improvement in Jsc is not as high as we expected. Therefore we have also developed another new dye, FSD-80, which demonstrates longer wavelength and a higher quantum efficiency at the same time. FSD-80 achieved a Jsc of 25.5mA/cm2. We also synthesized FSD-77, which gives an on set of IPCE at around 980nm that is 100nm longer than that of FSD-19.

2. Development of highly efficient and highly durable sensitizing dyes
 The cells employing FSD-40, a dye we created, was confirmed to have higher durability under the heat test condition described as B-1 in JIS C8938 than that with FSD-19. We found some essences of structural designs with which a dye can improve both efficiency and durability at the same time. We also found that the phosphonic acid group as an anchor in the organic dye was effective in increasing the long-term heat stability of the DSSC. We have also synthesized several organic dyes MK-121, -122, -123, -135, and -136 for DSSCs with the cobalt complex redox system, which have the highly steric hindered triphenylamine donor (AFLO donor), and the high voltage (over 900 mV) of DSSCs was achieved.
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