成果報告書詳細
管理番号20120000000578
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研究開発 (高効率タンデム用色素材料の研究開発)
公開日2013/10/31
報告書年度2011 - 2011
委託先名新日鐵化学株式会社
プロジェクト番号P07015
部署名新エネルギー部
和文要約和文要約等(以下本編抜粋)
可視光から赤外光までの広帯域に光電変換できるタンデム型色素増感太陽電池用長波長色素の開発を実施した。平成23年度は“色素骨格ごとの軌道のエネルギー準位と吸収波長の関係調査および1100nmに届く骨格の設計指針の改良を行い、さらに効率向上のための改良設計”を目的とした。900-1100nm領域に吸収を有する公知色素に対し置換基を付与する構造について、分子軌道準位を計算化学で予測し、発電が期待できる色素構造を選択して合成経路の開発を行った。K系と名づけた色素では約30化合物の計算を行い、軌道準位がSnO2に適合する色素を絞り込んだ。この中から、アンカー基を有する色素7化合物を合成することができた。そのうち実測で軌道準位が合うもの3化合物についてセル評価を行った。しかし、発電は確認できなかった。励起寿命の短さが発電できない原因として考えられた。次に、寿命が長いL系色素に注目し、TiO2用可視光領域長波長色素とSnO2用近赤外長波長色素について軌道準位の予測計算を行い、TiO2,SnO2それぞれに適合する色素を合成した。TiO2用に設計した色素は吸光係数の増大を狙った設計を行い、予測通りの吸光係数の大きい色素を合成できた。SnO2用には長波長でかつ、励起寿命を長くする設計を行い、吸収端980nm効率2.7%の色素を合成することができた。
英文要約Title: Research and development of high efficient and low-cost dye-sensitized solar cells suitable for mass production by designing three coordinated interfaces (FY2010-2012) FY2011 Annual Report
Our purpose is to develop tandem dye-sensitized solar cells with 15% efficiency by the end of 2014 fiscal year through the coraboration of Kyushu Institute of Technology(KIT) and Nippon Steel ChemicalCo.Ltd.(NSCC). This subject is consist of two sub-themes. One is to develop tandem cell structure by KIT, the other is to develop near infrared dyes suitable for the tandem cell by KIT and NSCC. The goal of this year for NSCC is to modify mother structures of dyes covering wavelengths up to 1000 nm. and develop symthtic root for those dyes. We selected one potetial NIR dye structure named K series last year and designed adding anchor functional group to fit molecular orbital energy level suitable for SnO2 semiconductor electrode. About 30 structures, molecular orbital calculation was done to estimate MO energy levels. 7 compounds were synthesized and evaluated HOMO by work function using Phtoto-Electron Spectroscopy in Air (PESA) and LUMO by UV-Visible spectroscopy. 3 compounds having energy levels suitable for SnO2 by PESA were obtained, and these dyes had absorption maxima at ca.910nm and 1010nm. Designing absorption wavelength of dye molecules and adjusting MO levels were successful, however none of them did not produce photo current due to short photo excitation life time. We surveyed dye structures having longer photo excitation life time and selected 2nd leading structure named K series compounds. K series copounds had absorption maxima at both visible wavelenth region and NIR region. We first designed dyes with absorption at visible region using TiO2 semiconductor electrode. We tried to enhance absorption strength and synthesized dyes having strong absoptoion at shorter wavelength. However, photone to current efficiency of the dye was not high than N719 Ru dye. 2nd, we tried to design NIR dye using K series. More than 120 structures were calculated their MO levels and absorption maxima. Because of symmetry of K series development of synthetic method controlling symmetrical and unsymmetrical structures were one difficult subject. About 40 compounds were tried to synthesized, and 10 compounds were obtained. In those dyes, we symthesized a dye which has main absorption at visible region with absorption edge at 980nm and 2.7% as photo-electric conversion efficiency using SnO2 semiconductore electrode. We would like to improve IPCE at longer wavelength region next year.
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