Developement of Organic Solar Cells Having Super-bulkhetero Junctions

• Project/Area Number: 17K19110
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Research Field: Physical chemistry, Functional solid state chemistry, and related fields
• Research Institution: Institute for Molecular Science
• Principal Investigator: Hiramoto Masahiro 分子科学研究所, 物質分子科学研究領域, 教授 (20208854)
• Project Period (FY): 2017-06-30 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000); Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2017: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
• Keywords: 水平多層交互接合 / 超バルクヘテロ接合 / 超高速移動度 / 飛程 / 横取り出し / 励起子収集 / キャリア収集 / 有機太陽電池 / 水平接合 / 水平取り出し距離 / 再結合 / 交互積層接合 / キャリア水平取り出し / ブレンド接合 / 超格子 / キャリア横取り出し / バンド伝導 / 太陽電池 / 有機半導体単結晶 / 超バルクへテロ接合

Outline of Final Research Achievements

Bulkheterojunctions (blended junctions) are indispensable for organic solar cells. However, the fabrication of electron and hole transport routes in bulkheterojunction remains quite challenging. Here, a lateral alternating multilayered junction having an ability to collect both excitons and carriers almost completely, which can be regarded as an alternative bulkheterojunction, is successfully demonstrated. The present new concept paves the way to exceed the conversion efficiency of organic solar cells above 20%.

Academic Significance and Societal Importance of the Research Achievements

「水平交互多層接合」は、混合接合を超える設計コンセプトで学術的オリジナリティーが非常に高い。垂直方向膜厚は輸送に無関係で限りなく厚くできるため、有機分子の吸収の多様性を活かして太陽光スペクトルの大部分を細かく分割して活用することで、20%以上の高効率化が望める。なお、電極間距離は1.8 cmまで可能で、金属マスクで簡便に大面積モジュールを製造できる。有機太陽電池の効率は着実に向上しており、フレキシブル、カラフル、軽量、塗布可能、安価、等の利点を活かして、近い将来、太陽電池の主役となると考えている。

Research Products

• [Int'l Joint Research] Thidarat Kunawong （マヒドール大）(タイ)
• [Int'l Joint Research] Makmuang Sureerat（チュラロンコン大）(タイ)
• [Journal Article] Donor/Acceptor Photovoltaic Cells Fabricated on p-Doped Organic Single-Crystal Substrates (2020)
  • Author(s): Yusuke Yabara, Seiichiro Izawa, and Masahiro Hiramoto
  • Journal Title: Materials Volume: 13 Issue: 9 Pages: 2068-2075
  • DOI: 10.3390/ma13092068
  • Peer Reviewed / Open Access
• [Journal Article] Lateral Alternating Donor/Acceptor Multilayered Junction for Organic Solar Cells (2019)
  • Author(s): Mitsuru Kikuchi, Masaki Hirota, Thidarat Kunawong, Yusuke Shinmura, Masahiro Abe, Yuichi Sadamitsu, Aye Myint Moh, Seiichiro Izawa, Masanobu Izaki, Hiroyoshi Naito, Masahiro Hiramoto
  • Journal Title: ACS Applied Energy Materials Volume: ２ Issue: 3 Pages: 2087-2093
  • DOI: 10.1021/acsaem.8b02135
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Bandgap Science for Organic Solar Cells (2019)
  • Author(s): Masahiro Hiramoto, Seiichiro Izawa
  • Organizer: 2nd International Conference on Materials Research and Innovation (ICMRI), Bangkok, Thailand
  • Int'l Joint Research / Invited
• [Presentation] Bandgap Science for Organic Solar Cells (2019)
  • Author(s): Masahiro Hiramoto
  • Organizer: IMS-PCOSS Bilateral Symposium, Xiamen University, Xiamen, China
  • Int'l Joint Research / Invited
• [Presentation] 高移動度有機半導体を用いた有機太陽電池 (2019)
  • Author(s): 平本昌宏
  • Organizer: 第９回高専―TUT（豊橋技術科学大学）太陽電池合同シンポジウム＆半導体材料・デバイス研究ネットワークセミナー
  • Invited
• [Presentation] 高移動度有機半導体を用いた有機太陽電池 (2019)
  • Author(s): 平本昌宏、伊澤誠一郎
  • Organizer: 有機エレクトロニクス研究会
  • Invited
• [Presentation] ドーピングルブレン単結晶光起電力セル (2018)
  • Author(s): 菊地 満、Makmuang Sureerat、伊澤誠一郎、平本昌宏
  • Organizer: 第79回応用物理学会秋季学術講演会
• [Presentation] Rubrene Single Crystal Photovoltaic Cells Using Lateral Carrier Transport (2018)
  • Author(s): Sureerat Makmuang, Mitsuru Kikuchi, Seiichiro Izawa, Masahiro Hiramoto
  • Organizer: 第65回応用物理学会春季学術講演会
• [Presentation] Single Crystal Organic Photovoltaic Cells Using Lateral Electron Transport (2017)
  • Author(s): Mitsuru Kikuchi, Kenichiro Takagi, Hiroyoshi Naito, and Masahiro Hiramoto
  • Organizer: 2017 E-MRS Spring Meeting
  • Int'l Joint Research
• [Presentation] 高移動度有機単結晶膜を用いたD/A超格子型有機太陽電池 (2017)
  • Author(s): 菊地 満、Aya Myint Moh、阿部 正宏、貞光 雄一、内藤 裕義、伊﨑 昌伸、平本 昌宏
  • Organizer: 第78回応用物理学会秋季学術講演会
• [Presentation] Single Crystal Organic Photovoltaic Cells Using Lateral Electron Transport (2017)
  • Author(s): Mitsuru Kikuchi, Kenichiro Takagi, Hiroyoshi Naito, and Masahiro Hiramoto
  • Organizer: The 27th Photovoltaic Science and Engineering Conference (PVSEC-27)
  • Int'l Joint Research
• [Book] Lateral Junction for Single Crystalline Organic Solar Cells (2019)
  • Author(s): Masahiro Hiramoto, Mitsuru Kikuchi, Seiichiro Izawa
  • Total Pages: 35
  • Publisher: NOVA Science Publishers, Inc.
  • ISBN: 9781536165418
• [Book] 水平交互多層接合による新コンセプト有機太陽電池の開発 (2019)
  • Author(s): 平本 昌宏、菊地 満、伊澤誠一郎
  • Total Pages: 7
  • Publisher: 月刊「クリーンエネルギー」、日本工業出版（株）
• [Remarks] 平本Gホームページ
  • URL: https://groups.ims.ac.jp/organization/hiramoto_g/