成果報告書詳細
管理番号20110000000776
タイトル*平成22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・高耐久性モジュールに関する研究開発)
公開日2011/9/28
報告書年度2010 - 2010
委託先名シャープ株式会社
プロジェクト番号P07015
部署名新エネルギー部
和文要約色素増感太陽電池の高効率化技術、低コスト化技術、量産化技術、信頼性向上技術に関する技術開発を実施するにあたって、色素増感太陽電池の三層(酸化物半導体、色素、電解質)に注目し、それらの材料開発、光電変換現象、劣化機構の解析をおこなうとともに、それらを反映した高効率セル及びモジュールの試作評価、信頼性に関する評価をおこなう。本事業ではモジュールの開発を進める。
(1)集積モジュール化技術の研究開発
色素増感太陽電池における各種モジュール構造を、低コスト性と量産性の両面から解析を行った。 低コスト・量産型色素増感太陽電池モジュールには、TOC基板一枚構造のモノリシック型が最有力であると結論付け、さらにモノリシック型構造の課題抽出をした。また5cm角のモジュールを作製し、変換効率7.6%を達成した。
(2)信頼性向上技術の研究開発
光照射に対する劣化メカニズムを物理的・化学的に解析するために、既存材料で構成されたセルを用いた性能低下要因究明をおこなった。紫外光が素子劣化に大きく影響しているが、劣化を受ける部分は電解液が主であることが示唆される結果を得た。また、難沸点溶媒であり高信頼性要素材料として有力であるイオン液体についてドナー性、アクセプター性、拡散係数、レドックス電位等の観点から電子注入反応の効率を評価した。 今後はイオン液体の設計指針を明確化し、デバイス実証に貢献して行く予定である。
英文要約Our purpose is to develop tandem dye-sensitized solar cells with 15% efficiency by the end of 2014 fiscal year.The goal of this year is
1.To propose a tandem structure and to verify the tandem performance.
2.Development of mother structures of dyes covering wavelengths up to 1000 nm.
1.To propose a tandem structure and to verify the tandem performance.
We proposed a tandem structure in which two electrodes were equipped in one cell structure.The top cell consists of FTO glass/porous titania layer stained with a dye covering visible region and the bottom cell consists of catalyst layer/porous SnO2 layer stained with a dye covering IR regions/glass mesh sheet. The strategy to achieve 15 % was discussed, leading the conclusion that 15 % efficiency is attainable. Two model dyes (dye 2 λmax: 450 nm, dye 1. λmax: 650 nm) were employed to prove the tandem performance. The IPCE curve for the cell had two peals (450 and 650 nm), demonstrating that electrons were collected from both a top and a bottom electrode and the cell worked as tandem cell.
2.Development of mother structures of dyes covering wavelengths up to 1000 nm.
In order to develop these IR dyes, the following process was taken. 1. Estimation ofλmax, HOMO-LUMO energy levels, and electron distribution of LUMO. IR dye structures were selected before actual syntheses were carried out. 2. To find synthetic route to synthesize IR dyes. 3. Measurement of HOMO-LUMO energy levels. 4. Measurement of solar cell performance for cells stained with these synthesized IR dyes.
9 dyes were synthesized. It was found that one of these dyes covered wavelengths up to 1300 nm. By these results, mother structures of IR dye candidates were selected. LUMO energy levels for these dyes were high enough for electrons to inject from LUMO of dyes to a SnO2 conduction band. However, HOMO energy levels may be a little high for electrons to inject from redox level to HOMO of dyes. Single cells consisting of some dyes were prepared and the solar cell performances were discussed. IPCE curves for these cells covered wavelengths up to 1000-1200 nm, showing that these IR dyes have potential for a composition of a bottom electrode which is active for IR regions. In order to increase the efficiency more, HOMO levels of dyes have to be lowered.
We achieved our goals in 2011 as follows.
1.It was proved that the cell structure we proposed was verified to work as tandem cells.
2.It was found that dyes covering wavelengths up to 1300 nm was synthesized,some of which were proved to generate electrons at wavelength up to 1200 nm.
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