Organic solar cells with high mobility materials

• Project/Area Number: 18K14115
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 29010:Applied physical properties-related
• Research Institution: Institute for Molecular Science
• Principal Investigator: Izawa Seiichiro 分子科学研究所, 物質分子科学研究領域, 助教 (60779809)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 有機太陽電池 / 界面 / 移動度 / 電荷分離 / 電荷再結合 / ドーピング

Outline of Final Research Achievements

Reducing an energy loss in output voltage are critically important for further enhancing the efficiency of organic solar cells (OSCs). Here, we report that the OSCs with high charge mobility and highly crystalline donor (D) and acceptor (A) materials is able to reach open circuit voltage (VOC) close to theoretical limit and fill factor (FF) of near 0.8. The high crystallinity at the several molecular layers near to the D/A interface were important for realizing high VOC and FF. The reasons for high VOC and FF are that the highly crystalline D/A interface reduced the energy loss in output voltage related to the trap assisted recombination. Our results demonstrated that careful design of D/A interface enables us to approach high power conversion efficiency in OSCs close to theoretical limit of the single junction solar cells.

Academic Significance and Societal Importance of the Research Achievements

本研究では発電が起こる界面近傍の結晶性を向上できれば、有機太陽電池の光電変換効率を高効率無機太陽電池と同等の水準まで向上できること、つまり有機太陽電池で効率20％超も実現可能であることを示した。今回の成果は界面の構造が制御しやすい二層型のモデルデバイスで得られたものだが、今後、界面面積が大きく実用的なデバイス構造である混合型の有機太陽電池でも、新たな材料開発により同様に界面近傍の結晶性を制御できれば、有機太陽電池の光電変換効率を大幅に向上につながると考えられる。

Research Products

• [Journal Article] Efficient Interfacial Upconversion Enabling Bright Emission at an Extremely Low Driving Voltage in Organic Light‐Emitting Diodes (2022)
  • Author(s): Izawa Seiichiro、Morimoto Masahiro、Naka Shigeki、Hiramoto Masahiro
  • Journal Title: Advanced Optical Materials Volume: 10 Issue: 4 Pages: 2101710-2101710
  • DOI: 10.1002/adom.202101710
  • Peer Reviewed / Open Access
• [Journal Article] Efficient solid-state photon upconversion enabled by triplet formation at an organic semiconductor interface (2021)
  • Author(s): Izawa Seiichiro、Hiramoto Masahiro
  • Journal Title: Nature Photonics Volume: 15 Issue: 12 Pages: 895-900
  • DOI: 10.1038/s41566-021-00904-w
  • Peer Reviewed
• [Journal Article] Curved Perylene Diimides Fused with Seven‐Membered Rings (2021)
  • Author(s): Fujimoto Keisuke、Izawa Seiichiro、Takahashi Ayumu、Inuzuka Toshiyasu、Sanada Kazutaka、Sakamoto Masami、Nakayama Yasuo、Hiramoto Masahiro、Takahashi Masaki
  • Journal Title: Chemistry An Asian Journal Volume: 16 Issue: 6 Pages: 690-695
  • DOI: 10.1002/asia.202100066
  • Peer Reviewed
• [Journal Article] Influence of N‐Substituents on Photovoltaic Properties of Singly Bay‐Linked Dimeric Perylene Diimides (2021)
  • Author(s): Izawa Seiichiro、Uchida Kentaro、Nakamura Mayuko、Fujimoto Keisuke、Roudin Jeremy、Lee Ji‐Hyun、Inuzuka Toshiyasu、Nakamura Takumi、Sakamoto Masami、Nakayama Yasuo、Hiramoto Masahiro、Takahashi Masaki
  • Journal Title: Chemistry A European Journal Volume: 27 Issue: 56 Pages: 14081-14091
  • DOI: 10.1002/chem.202102318
  • Peer Reviewed
• [Journal Article] Simultaneous measurement of photocurrent and recombination emission in organic solar cell (2021)
  • Author(s): Lee Ji-Hyun、Hiramoto Masahiro、Izawa Seiichiro
  • Journal Title: Japanese Journal of Applied Physics Volume: 61 Issue: 1 Pages: 011001-011001
  • DOI: 10.35848/1347-4065/ac4051
  • Peer Reviewed
• [Journal Article] Photoconversion Mechanism at pn-Homojunction Interface in Single Organic Semiconductor (2020)
  • Author(s): Ji-Hyun Lee, Armand Perrot, Masahiro Hiramoto, Seiichiro Izawa
  • Journal Title: Materials Volume: 13 Issue: 7 Pages: 1727-1727
  • DOI: 10.3390/ma13071727
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Regioselective Bay‐Functionalization of Perylenes Toward Tailor‐Made Synthesis of Acceptor Materials for Organic Photovoltaics (2020)
  • Author(s): Fujimoto Keisuke、Izawa Seiichiro、Arikai Yusaku、Sugimoto Shinya、Oue Hirona、Inuzuka Toshiyasu、Uemura Naohiro、Sakamoto Masami、Hiramoto Masahiro、Takahashi Masaki
  • Journal Title: ChemPlusChem Volume: 85 Issue: 2 Pages: 285-293
  • DOI: 10.1002/cplu.201900725
  • Peer Reviewed
• [Journal Article] Importance of interfacial crystallinity to reduce open-circuit voltage loss in organic solar cells (2019)
  • Author(s): Izawa Seiichiro、Shintaku Naoto、Kikuchi Mitsuru、Hiramoto Masahiro
  • Journal Title: Applied Physics Letters Volume: 115 Issue: 15 Pages: 153301-153301
  • DOI: 10.1063/1.5114670
  • Peer Reviewed
• [Journal Article] Organic pn Homojunction Solar cell (2019)
  • Author(s): Seiichiro Izawa, Armand Perrot, Jihyun Lee, Masahiro Hiramoto
  • Journal Title: Organic Electronics Volume: 71 Pages: 45-49
  • DOI: 10.1016/j.orgel.2019.04.039
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Parts‐per‐Million‐Level Doping Effects in Organic Semiconductor Films and Organic Single Crystals (2019)
  • Author(s): Masahiro Hiramoto, Mitsuru Kikuchi, Seiichiro Izawa
  • Journal Title: Advanced Materials Volume: 31 Issue: 1 Pages: 1801236-1801251
  • DOI: 10.1002/adma.201801236
  • Peer Reviewed
• [Journal Article] Doped organic single-crystal photovoltaic cells (2019)
  • Author(s): Mitsuru Kikuchi, Sureerat Makmuang, Seiichiro Izawa, Kanet Wongravee, Masahiro Hiramoto
  • Journal Title: Organic Electronics Volume: 64 Pages: 92-96
  • DOI: 10.1016/j.orgel.2018.10.015
  • Peer Reviewed / Int'l Joint Research
• [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
• [Journal Article] Doping for Controlling Donor/Acceptor Interfacial Structure in Organic Solar Cells (2019)
  • Author(s): Seiichiro Izawa, Masahiro Hiramoto
  • Journal Title: The Review of Laser Engineering Volume: 47 Pages: 151-155
  • NAID: 130008074022
  • Peer Reviewed
• [Journal Article] Effect of Band Bending and Energy Level Alignment at the Donor/Acceptor Interface on Open-Circuit Voltage in Organic Solar Cells (2018)
  • Author(s): Seiichiro Izawa, Naoto Shintaku, Masahiro Hiramoto
  • Journal Title: The Journal of Physical Chemistry Letters Volume: 9 Issue: 11 Pages: 2914-2918
  • DOI: 10.1021/acs.jpclett.8b01134
  • Peer Reviewed
• [Presentation] 界面アップコンバージョンを利用した超低駆動電圧の有機EL (2022)
  • Author(s): 伊澤誠一郎, 森本勝大, 中茂樹, 平本昌宏
  • Organizer: 第69回応用物理学会 春季学術講演会
• [Presentation] ペリレンジイミドの精密合成による有機太陽電池の電圧損失削減 (2020)
  • Author(s): 伊澤 誠一郎, 藤本 圭佑, 高橋 雅樹, 平本 昌宏
  • Organizer: 第81回応用物理学会秋季学術講演会
• [Presentation] 有機半導体界面で起こる電荷分離と再結合 (2020)
  • Author(s): 伊澤 誠一郎
  • Organizer: 応用物理学会北陸・信越支部講演会
  • Invited
• [Presentation] ペリレンジイミドのベイ位置の修飾による有機太陽電池の電圧損失削減 (2020)
  • Author(s): 伊澤 誠一郎, 藤本 圭佑, 高橋 雅樹, 平本 昌宏
  • Organizer: 第67回応用物理学会春季学術講演会
• [Presentation] 高結晶性ペリレンジイミド二量体の開発と有機太陽電池への応用 (2020)
  • Author(s): 伊澤 誠一郎, 藤本 圭佑, 高橋 雅樹, 平本 昌宏
  • Organizer: 第67回応用物理学会春季学術講演会
• [Presentation] 有機太陽電池の電圧損失抑制のための界面構造探索と新規分子の開発 (2020)
  • Author(s): 伊澤 誠一郎
  • Organizer: 2020年 電子情報通信学会総合大会
  • Invited
• [Presentation] Controlling Donor/Acceptor Interfacial Structures in Organic Solar Cells (2019)
  • Author(s): Seiichiro Izawa, Naoto Shintaku and Masahiro Hiramoto
  • Organizer: 10th International Conference on Molecular Electronics & BioElectronics
  • Int'l Joint Research
• [Presentation] pnホモ接合有機太陽電池 (2019)
  • Author(s): 伊澤 誠一郎, Perrot Armand, Lee JiHyun, 平本 昌宏
  • Organizer: 第66回応用物理学会 春季学術講演会
• [Presentation] 有機薄膜太陽電池における界面のエネルギー準位接続制御 (2019)
  • Author(s): 伊澤 誠一郎, 平本 昌宏
  • Organizer: 日本化学会 第99春季年会
• [Presentation] Effect of Interfacial Donor/Acceptor Structures on Open-Circuit Voltage in Organic Solar Cells (2018)
  • Author(s): Seiichiro Izawa, Naoto Shintaku, Masahiro Hiramoto
  • Organizer: The International Conference on Science and Technology of Synthetic Metals 2018
  • Int'l Joint Research
• [Presentation] バンド伝導材料による有機太陽電池の開放端電圧ロスの抑制 (2018)
  • Author(s): 伊澤 誠一郎, 新宅 直人, 菊地 満, 平本 昌宏
  • Organizer: 第79回応用物理学会 秋季学術講演会
• [Presentation] ドーピングによる有機太陽電池界面でのエネルギー準位接続制御 (2018)
  • Author(s): 伊澤 誠一郎, 新宅 直人, 平本 昌宏
  • Organizer: 第67回高分子討論会
• [Book] Organic Solar Cells Energetic and Nanostructural Design (2021)
  • Author(s): Masahiro Hiramoto, Seiichiro Izawa
  • Total Pages: 267
  • Publisher: Springer
  • ISBN: 9789811591136
• [Remarks] 有機太陽電池の電圧損失の抑制に成功
  • URL: https://www.ims.ac.jp/news/2019/10/16_4448.html
• [Remarks] 色素分子の精密合成で有機太陽電池の電圧損失を３割削減に成功
  • URL: https://www.ims.ac.jp/news/2020/02/05_4552.html