成果報告書詳細
管理番号20120000000526
タイトル*平成23年度中間年報 最先端研究開発支援プログラム/低炭素社会に資する有機系太陽電池の開発/光電変換の原理解明に基づく高効率有機薄膜太陽電池の開発
公開日2012/12/26
報告書年度2011-2011
委託先名国立大学法人京都大学
プロジェクト番号P09026
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.研究開発の内容及び成果等 サブテーマ(8) (8)-1 高効率有機薄膜太陽電池のための材料開発 (平成23年度第1四半期~第4四半期実施) 有機薄膜太陽電池の高効率化を実現するには、光電変換の基幹プロセスであるヘテロ接合界面での電荷生成・再結合機構を解明する必要がある。そこで、本課題では、電子ドナー(D)/アクセプター(A)二層膜モデル系を設計し、過渡分光測定を適用できるモデル界面をもつテストセルの試作を目指した。
英文要約Funding Program for World-Leading Innovative R&D on Science and Technology / Development of Organic Photovoltaics toward a Low-Carbon Society / Development of Highly Efficient Organic Solar Cells Based on Photovoltaic Conversion Mechanism
(FY2010-FY2011) FY2011 Annual Report
VIII-1. New Materials for Highly Efficient Organic Solar Cells
(From the first quarter to the fourth quarter of 2011)
In 2011, we newly synthesized a fullerene derivative bearing thermally cross-linkable styryl groups (bis-PCBVB). The bis-PCBVB was spin-coated on glass substrates and in situ cross-linked by annealing at 170 °C for 60 min. After cross-linking, a robust, smooth, and solvent-resistant film (p-PCBVB) was obtained. The HOMO energy level of p-PCBVB was estimated to be 3.8 eV, showing that p-PCBVB acts as an electron acceptor for typical conjugated polymers. As shown in Fig. 1, well-defined polymer/fullerene D/A bilayer films were designed by spin-coating conjugated polymers as electron donor on top of this p-PCBVB. These D/A bilayers provide a model system for studying exciton diffusion, charge generation, and charge recombination at organic interfaces, which are key processes deciding solar cell efficiency.
VIII-2. Transient Absorption Spectroscopy in Organic Solar Cells
(From the first quarter to the fourth quarter of 2011)
In 2011, we developed transient absorption spectroscopy system for studying interfacial charge generation and recombination. We first evaluated exciton diffusion length (LD) in conjugated polymers by using our D/A bilayer systems. The fluorescence quenching efficiency (~q) of PFC layer was measured for PFC/p-PCBVB bilayers with different PFC thickness (9 ~ 71 nm). By analyzing the thickness dependence of ~q with one-dimensional diffusion model, LD of PFC was evaluated to be 11 nm (Fig. 2). We next addressed the direct observation of charge generation and recombination dynamics at the PFC/p-PCBVB interface. To improve the signal-to-noise ratio of transient absorption (~OD) from the interface, we newly designed A/D/A trilayer films. As shown in Fig. 3, we successfully observed the exciton diffusion followed by the charge generation at the D/A interface. This approach by using A/D/A trilayer systems opens the way for in-depth understanding of photophysics at organic interfaces.
ダウンロード成果報告書データベース(ユーザ登録必須)から、ダウンロードしてください。

▲トップに戻る