成果報告書詳細
管理番号20110000000778
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(高効率タンデム化技術に関する研究開発)
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
和文要約この開発の目的は平成24年度末までに変換効率15%のタンデム構造色素増感太陽電池を開発することである。平成22年度の目的は1)一セル内二電極型色素増感太陽電池の提案と機能確認、2)波長1000nmまでの光を吸収する色素の母体構造の合成である。
1)一セル内二電極型色素増感太陽電池の提案と機能確認
 トップ電極は透明導電膜基板/チタニア色素A層から、ボトム電極はチタニア色素B層/ガラスメッシュシートからなり、一セル内に二電極を設置したタンデム構造のセルを評価した。IPCE(分光感度特性)にはトップ層、ボトム層に起因するピークが検出されタンデム機能を確認した。
2)波長1000μmまでの光を吸収する色素の母体構造の合成
 長波長の吸収が予測される色素骨格について量子化学計算をおこない、酸化物半導体への電子注入、レドックス対との電子授受ができる骨格の候補を選定し、その合成経路を開発した。その結果、1000~1300nmに吸収を有する色素母体を得ることに成功した。
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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