成果報告書詳細
管理番号20120000000769
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 (高効率タンデム化技術に関する研究開発)
公開日2013/6/25
報告書年度2011 - 2011
委託先名国立大学法人九州工業大学
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。モデル色素を使い、従来の透明導電膜ガラス基板3枚を使ったタンデムセルよりも低コスト化が期待できる透明導電ガラス基板を一枚で作製できるバックコンタクト型タンデム太陽電池の基本性能を実証できた。タンデム太陽電池のボトム電極に使う酸化錫用の色素構造はチタニア系と大きく異なっており、酸化錫用に高い効率が期待できる赤外色素の構造を絞ることができた。また、金属-酸素-金属結合で酸化錫表面に大環状型色素を吸着させると酸化錫上で酸化チタンよりも優れた性能を発揮できることがわかった。これらの知見をもとに1300nmまで光を吸収できる酸化錫-色素複合系を作製することができた。単セル構造用色素の開発では近赤外色素(900 nm端)開発の設計指針を明確にするためにスクアリル色素を使って注目すべき項目を調べた。HOMO-LUMO準位、アンカー基上でのLUMO軌道の存在、などの条件を満たしても、長波長化するにつれ、励起寿命が短くなり発電しにくくなることがわかった。1nsec以上の寿命を有する色素設計が必要であることを提案できた。
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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