成果報告書詳細
管理番号20110000000598
タイトル*平成22年度中間年報 最先端研究開発支援プログラム/低炭素社会に資する有機系太陽電池の開発/超高効率色素増感太陽電池を目指した新規増感色素の探索/有機薄膜太陽電池の劣化機構の解明
公開日2011/8/5
報告書年度2010 - 2010
委託先名独立行政法人産業技術総合研究所
プロジェクト番号P09026
部署名新エネルギー部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等 1.1. 超高効率色素増感太陽電池を目指した新規増感色素の探索(サブテーマ(6))/色素基本情報の構築、色素増感太陽電池の電池特性情報の構築 色素増感太陽電池において、今後大幅な光電変換効率の向上を達成するためには、可視光だけでなく近赤外光も効率よく光電変換できる高性能増感色素を開発することが必要であり、その場合は増感色素のエネルギー準位を適切な値にチューニングすることが重要となる。
英文要約Title: Reserch on sensitizers for highly efficient dye-sensitized solar cells, Development of organic photovoltaics toward a low-carbon society, Funding Program for World-Leading Innovative R&D on Science and Technology (FY2010-FY2011) FY2010 Annual Report
Polypyridine ruthenium(II) complexes as sensitizers for dye-sensitized solar cells (DSCs) have been widely investigated to improve the conversion efficiency of DSCs. The development of sensitizers to extend the absorption edge is one of the most important issues, as the solar spectrum has a large photon flux in the 500~1000 nm region.
The tuning of the energy levels of the sensitizers is also an important issue. Polypyridine Ru(II) complexes with bidentate donor ligand(s) are known as sensitizers for DSCs. We have examined the introduction of substituent(s) to a bidentate ligand to tune the redox energy levels of the Ru(II) complexes. Dye A having methoxy groups as substituents with donor character showed superior performance to dye B without methoxy groups.
Cyclometallated ruthenium(II) complexes are promising candidates of infrared sensitizers. Introduction of substituent(s) into the ligand in order to tune the energy levels was examined. As a preliminary result, Dye C showed 9.2 % of conversion efficiency.
For practical use of organic photovoltaic cells (OPV), long-term stability of the cell performance is essential, as well as high efficiency. In contrast to the considerable efforts on improving the PCE of OPV, researches on the stability of OPV have been performed only since the last few years so that the degradation mechanism and key technologies for improving the long-term stability are still unclear. In recent years, electroluminescence (EL) imaging is expected to be a fast quality control tool for inorganic solar panels in production lines.
In this study, we investigated micro defects of polymer-based OPV by EL imaging combined with morphological observations by cross-sectional transmission electron microscopy (TEM). In EL image taken under forward bias, we found dark spots in the OPV. In the dark spot area, a large grain (>100 nm
height) of PEDOT:PSS was observed. It is considered that PSS can easily access and oxidize counter aluminum (Al) electrode. Possibly, areas of oxidized Al will appear as dark spots. Moreover, we carried out reversed biased EL imaging. Bright spots were observed in the EL image. In the bright spot area, ITO surface was relatively rough and the surface was not covered with enough PEDOT:PSS layer. This suggests that high voltage bias is impressed between rough ITO and Al and then leakage occurred. In conclusion, EL imaging is a feasible tool for characterizing the micro defects in polymer-based organic solar cells. We believe that improving film quality will bring further not only the stability but also the efficiency of OPV.
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