成果報告書詳細
管理番号20120000000367
タイトル平成23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2013/1/18
報告書年度2011 - 2011
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
和文要約和文要約等以下本編抜粋
1. 高効率色素の開発では、有機色素に関しては、D-π-A型有機色素のπ-共役部位に電子リッチ構造を導入することでベンチマークの有機色素MK-2(800nm)よりもIPCEの長波端が長波長化する色素E6(850nm)の合成に成功した(綜研化学)。また、Ru色素に関しては、ターピリジンRu色素の短波可視域のε向上する設計により、Black Dye (Jsc= 19.9mA/cm-2, Voc = 0.69V, FF=0.67, PCE=9.25%)と同等以上の変換効率を示すFSD-20(Jsc=20.3mA/cm-2, Voc=0.70V, FF=0.69, PCE=9.8%)を開発した (富士フイルム)。また、コバルト錯体をレドックス対として用いた系で、効率の高い有機色素の設計指針を見出した(産総研)。
2. 高効率・高耐久モジュール用色素の開発としては、B-1試験でJsc低下を大幅に抑えるアンカー基を持つ新規有機色素を開発した(産総研)。また、ミニセルで変換効率6.7%でB-1試験後の効率低下率が10%以内となるRu色素FSD-19を開発した (富士フイルム)。
英文要約Title: Research and development of high-efficiency and low-cost dye-sensitized solar cells and their mass production technologies based on the three phase-harmonized interface; Development of highly efficient and durable sensitizing dyes (FY2010-2012).
FY2011 Annual Report
The purpose of this project is the development of highly efficient and stable sensitizing dyes that enable to fabricate highly efficient and long-term durable dye-sensitized solar cells that meet criteria for practical use. In FY 2011, we have investigated 1) effective structural designs of sensitizing dye to efficiently convert near infrared light to electricity, and 2) structural designs of sensitizing dyes with high stability in cell devices.
1. To apply our new concept on the design of dye structure, we chose ruthenium polypyridyl complex dyes, and metal-free organic donor-pai-acceptor (D-π-A) dyes, as basic skeleton of sensitizing dye. Firstly, we designed a new ruthenium complex dye, FSD-20, which has higher absorption extinction coefficient at the shorter-wavelength region (400-600nm) compared to Black Dye, a reference dye. We obtained promising device performance data with FSD-20; the best cell showed power conversion efficiencies as high as 10.8% so far, which supersedes our best reference cells using Black Dye. Secondly, we designed new pai-conjugation moieties for D-π-A dyes. At present, we succeeded in preparing an organic dye with a new pai-conjugation moiety, which is capable of giving absorption at longer wavelength of solar radiation than that in MK-2. In order to increase open circuit voltage, we also investigated what types of dyes give good performance in combination with cobalt redox couples. We found that the length and the position of the alkyl chains in the dye molecules play important roles to increase photovoltaic performances. In the series of dyes known as MK dyes, MK-14 and MK-33 are the best dyes so far. For example, MK-33 showed power conversion efficiencies as high as 6.25%. Further investigation is under way.
2. In order to improve the long-term stability of a dye-sensitizing solar cell device, it is important to identify major degradation mechanism of the device and to design dye molecules in accordance with the mechanism. Last year, we obtained the result indicating that the desorption of the dye from the surface of the titania can be one of the major mechanisms of cell degradation. This year, based on this result, we designed new series of dyes from two different approaches. First, we succeeded in preparation of a series of organic dyes, which possess phosphonic acid groups as anchors to the titania surface. These dyes exhibited higher stability in short-circuit current density under the condition of a long-term accelerated aging experiment at 85oC, compared to MK-2, a reference organic dye possessing a carboxylic acid group as an anchor group. As the second approach, we newly designed and successfully prepared FSD-19, a ruthenium complex dye, which is assembled using both 4,4’,4’’-tricarboxy-2,2’:6,2’’- terpyridine and a other polydentate ligand with a hydrophobic group. FSD-19 showed higher stability in power conversion efficiency during the heat test, compared to Black Dye, a reference ruthenium dye. The cells, fabricated with FSD-19, showed initial power conversion efficiency as high as 6.7%, which decreased by less than 0.6% during the long-term accelerated aging experiment at 85oC. Further research is currently in progress.
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