成果報告書詳細
管理番号20110000000605
タイトル*平成22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
公開日2011/6/29
報告書年度2010 - 2010
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
【14】-2 有機薄膜太陽電池及び有機半導体材料の研究開発
(平成22 年度第1四半期~第3四半期実施)
(1)有機半導体材料の開発
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 をベースとして種々の主鎖構造を検討し、新規ドナーポリマーを約10
種類合成した。合成検討した主鎖構造を、これまでに検討してきたN-P7 の主鎖構造である
キノキサリン( Q) 、チオフェン(T)、フルオレン(FL)と共に図1に示す。
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) FY2010 Annual Report
Toray Industries, Inc.
1. Development of organic semiconducting materials:
We have been developing organic semiconducting materials which constitute an active layer of organic thin-film solar cells. Our primary focus is on producing electron-donor materials. In order to draw up 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 conversion efficiency over 5%. The main-chain structure of N-P7 is mainly composed of quinoxaline and fluorene structure. This year, we synthesized more than 10 types of donor polymers having different main-chain structures.
Following results were obtained by the measurement of solar cell performances and analysis of newly developed donor polymers.
(1) We prepared some new donor polymers which have narrow the band-gap compared to NP-7. This narrowing is attributed to both a highly planar structure and less steric hindrance of building blocks composed of five-membered units.
(2) Several types of donor polymers with high planarity showed a low solubility assumedly due to the strong inter-polymer interaction. To enhance the solubility of these donor polymers, it is quite important to tune the chemical structures and the bonding position of side-chains.
(3) One of the donor polymers showed a relatively high fill factor (~0.67). It is assumed that there is some correlation between the high fill factor and the main-chain structure of the polymer. The conformation of the main-chain and orientation of this polymer which are different from those of the existing donor polymer such as NP-7 may affect the fill factor.
For the newly developed donor polymers mentioned above, we have accumulated the data for bulk heterojunction (BHJ) type solar cells and basic properties such as band-gap, HOMO level, and FET mobility. By using these data, we are going to figure out the detailed correlation between the photovoltaic properties and donor polymer structures.
2. Structural analysis and construction of database towards the high efficiency solar cell:
The analysis was conducted in collaboration with Toray Research Center, Inc. A variety of techniques such as SIMS, RAMAN, TOF-Depth, solid NMR, GI-SAXS, STEM-ADF, IR, RAMAN, and X-ray diffraction were carried out to analyze the BHJ structures. The main results obtained by these analytical techniques are as follows:
(1) The BHJ domain size of the N-P7 was estimated between several nanometers and tens of nanometers by analyzing the relaxation time of the solid NMR measurement. This result suggests that solid NMR measurement is an effective method to analyze the domain size of the BHJ thin-films.
(2) IR measurements of BHJ thin-films provide useful information about the polymer orientation. For a new donor polymer prepared this year, it was found that the ~-conjugated plane aligned perpendicular to the substrates. Since information of the orientation of donor polymers in the BHJ thin-film is particularly important, we will be using IR measurement as a useful technique to analyze the BHJ morphology.
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