成果報告書詳細
管理番号20120000000534
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/高効率有機薄膜太陽電池の作製(有機薄膜太陽電池及び有機半導体材料の研究開発)
公開日2013/1/18
報告書年度2011 - 2011
委託先名東レ株式会社
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
 有機薄膜太陽電池の発電層を構成する基本材料である有機半導体材料について、ドナーポリマーを中心に開発を行った。本年度は高変換効率に向けた材料設計指針を探るため、当社ドナーポリマーN-P7の主鎖構造を出発点として主鎖構造と側鎖構造を検討し、種々の新規ドナーポリマーを合成した。
英文要約Title: Funding Program for World-Leading Innovative R&D on Science and Technology / Development of organic photovoltaics toward a low-carbon society / Research and Development of Organic Thin-Film Solar Cells and their Organic Semiconductors
(FY2010-FY2011) FY2011 Annual Report Toray Industries, Inc.
1. Development of organic semiconducting materials:
We have been developing organic semiconducting materials which constitute the active layer of an organic thin-film solar cell. Our primary focus is on producing electron-donor materials. In order to establish a guiding principle of donor materials for higher conversion efficiency, we have investigated various main-chain structures of donor polymers, basing on the quinoxaline-based donor polymer (N-P7) which have been developed by us and shows power conversion efficiency over 5%. This year, we synthesized more than 30 types of donor polymers having different main-chain structures. For the newly developed donor polymers, we have accumulated many important data for bulk heterojunction (BHJ) type solar cells and basic properties such as solubility, band-gap, absorption coefficient, and HOMO energy level. In this study, we have successfully obtained some new donor polymers having three essential properties for achieving power conversion efficiency of over 10%, i.e., (1) narrow band-gap (< 1.7 eV), (2) high absorption coefficient (> 150,000 cm-1) and (3) deep HOMO energy level (< -5.2 eV). We are going to optimize the main-chain and side-chains structures of such new donor polymers which have potential for high power conversion efficiency.
2. Structural analysis and construction of database towards a high efficiency solar cell:
A variety of analyses such as RAMAN, solid NMR, X-ray diffraction, IR and TEM were carried out to analyze the BHJ structures in collaboration with Toray Research Center, Inc. In this year, by three-dimensional TEM, we observed a clear network structure coming from the bulk heterojunction structure composed of our donor polymer N-P7 with PCBM acceptor. This result reveals that three-dimensional TEM measurement is one of the effective methods to evaluate the co-continuity of the donor and acceptor phase. We will be applying the three-dimensional TEM measurement as a useful technique to analyze the BHJ morphology together with other methods such as solid NMR and IR measurement.
3. Collaboration with other groups:
To investigate the correlation between the donor polymer structures and the photovoltaic processes, we carried out transient photo-absorption measurements for the donor polymer N-P7 in collaboration with Prof. Ito group of Kyoto University. The efficiency of exiton diffusion, charge transfer, charge dissociation, and charge collection is estimated. These results indicate that the charge dissociation and charge collection are rate-determining in the photovoltaic processes for the N-P7/PCBM system. We are going to apply this transient photo-absorption measurement method to our new donor polymers.
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