Elucidation of electronic structure and charge generation mechanism at photoelectric conversion disordered interface

• Project/Area Number: 15H06636
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Device related chemistry
• Research Institution: Tokyo University of Science
• Principal Investigator: Akaike Kouki 東京理科大学, 理工学部物理学科, 助教 (90581695)
• Project Period (FY): 2015-08-28 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 有機半導体界面 / 光電子分光 / 有機太陽電池 / 有機ヘテロ界面 / 界面構造 / 構造不均一性 / 界面電子構造 / 有機へテロ界面 / 結晶構造

Outline of Final Research Achievements

In this research, we tried to elucidate how interface structure impacts energy structure at organic heterojunctions. We found at first that the orientation of side chain f PC61BM, which is the acceptor material for organic photovotalics (OPVs), drastically changes upon crystallization of PC61M thin film. 6T film on the PC61BM exhibits wider terraces that that on as-coated PC61BM film due to the increased surface energy. We also found that F16CuPc/6T interface, where both materials are crystalline, has significant disordering/intermixing upon the interface formation, which revealed by X-ray diffraction and scanning tunneling microscopy. That observation reasonably explains the origin of the complex energy level alignment at the donor/acceptor interface.

Research Products

• [Journal Article] An autonomous actuator driven by fluctuations in ambient humidity (2016)
  • Author(s): H. Arazoe, D. Miyajima, K. Akaike, F. Araoka, E. Sato, T. Hikima, M. Kawamoto, T. Aida
  • Journal Title: Nature Materials Volume: 15 Issue: 10 Pages: 1084-1089
  • DOI: 10.1038/nmat4693
  • Peer Reviewed
• [Journal Article] Effective Work Function Reduction of Practical Electrodes Using an Organometallic Dimer (2016)
  • Author(s): K. Akaike, M. V. Nardi, M. Oehzelt, J. Frisch, A. Opitz, C. Christodoulou, G. Ligorio, P. Beyer, M. Timpel, I. Pis, F. Bondino, K. Moudgil, S. Barlow, S. R. Marder, N. Koch
  • Journal Title: Advanced Functional Materials Volume: 26 Issue: 15 Pages: 2493-2502
  • DOI: 10.1002/adfm.201504680
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A comprehensive and unified picture of energy-level alignment at interfaces with organic semiconductors (2016)
  • Author(s): K. Akaike, M. Oehzelt, G. Heimel, N. Koch
  • Journal Title: Proceedings of SPIE Volume: 9941 Pages: 1-7
  • DOI: 10.1117/12.2236848
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 有機ヘテロ界面における電子準位接続 (2016)
  • Author(s): 赤池 幸紀
  • Journal Title: 応用物理 Volume: 85 Pages: 776-782
  • NAID: 130007715350
  • Peer Reviewed
• [Journal Article] Energy-level alignment at organic heterointerfaces (2015)
  • Author(s): M. Oehzelt, K. Akaike, N. Koch, G. Heimel
  • Journal Title: Science Advances Volume: 1 Issue: 10
  • DOI: 10.1126/sciadv.1501127
  • NAID: 130007715350
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The Impact of Disorder on the Energy Level Alignment at Molecular Donor/Acceptor Interfaces (2015)
  • Author(s): K. Akaike, N. Koch, G. Heimel, M. Oehzelt
  • Journal Title: Advanced Materials Interfaces Volume: 2 Issue: 13 Pages: 13-13
  • DOI: 10.1002/admi.201500232
  • Peer Reviewed / Int'l Joint Research
• [Presentation] PC61BMの結晶性の違いによるPC61BM / α-6T界面の膜形態と電子構造 (2017)
  • Author(s): 熊井 拓実、赤池 幸紀、布施 拓也、出窪 俊祐、大西 瞭、田子 達寛、樫本 祐生、沼田 千尭、大内 駿、吉田 弘幸、金井 要
  • Organizer: 第64回応用物理学会春季学術講演会
  • Place of Presentation: パシフィコ横浜（神奈川県・横浜市）
  • Year and Date: 2017-03-14
• [Presentation] グラファイト上に成長したフラーレン薄膜の形態相図 (2017)
  • Author(s): 佐藤 利磨、田中 智尉、赤池 幸紀、金井 要
  • Organizer: 第64回応用物理学会春季学術講演会
  • Place of Presentation: パシフィコ横浜（神奈川県・横浜市）
  • Year and Date: 2017-03-14
• [Presentation] Energetic landscape correlated with interface structure at organic heterojunctions (2016)
  • Author(s): Kouki Akaike, Takumi Kumai, Takuya Fuse, Kaname Kanai
  • Organizer: Advanced Spectroscopy of Organic Materials for Electronic Applications
  • Place of Presentation: 岡崎コンファレンスセンター（愛知県・岡崎市）
  • Year and Date: 2016-11-23
  • Int'l Joint Research / Invited
• [Presentation] P3HT:PC61BM 混合膜内の P3HT の電子構造 (2016)
  • Author(s): 布施拓也、赤池幸紀、 熊井拓実、 出窪俊祐、 金井要
  • Organizer: 第77回応用物理学会秋季学術講演会,
  • Place of Presentation: 朱鷺メッセ（新潟県・新潟市）
  • Year and Date: 2016-09-13
• [Presentation] 静電ポテンシャル計算と光電子分光を併用した有機ヘテロ界面の解析 (2016)
  • Author(s): 赤池 幸紀
  • Organizer: 応用物理学会 有機分子・バイオエレクトロニクス分科会 研究会
  • Place of Presentation: 天童ホテル（山形県・天童市）
  • Year and Date: 2016-06-08
• [Presentation] 有機へテロ界面における電子準位接続の起源 (2016)
  • Author(s): 赤池幸紀
  • Organizer: 東北大学 高分子・ハイブリッド材料研究センター(PHyM)若手フォーラム
  • Place of Presentation: 東北大学
  • Year and Date: 2016-03-04
  • Invited
• [Presentation] Energy level alignment at organic heterointerfaces (2015)
  • Author(s): Kouki Akaike
  • Organizer: The 3rd Workshop on Physics in Organic Optoelectronics
  • Place of Presentation: Okazaki Conference Center
  • Year and Date: 2015-12-10
  • Int'l Joint Research / Invited
• [Presentation] The Impact of Disorder on the Energy Level Alignment at Molecular Donor/Acceptor Interfaces (2015)
  • Author(s): K. Akaike, N. Koch, G. Heimel, M. Oehzelt
  • Organizer: 2015 MRS Fall Meeting
  • Place of Presentation: Hynes Convention Center (Boston)
  • Year and Date: 2015-11-29
  • Int'l Joint Research
• [Presentation] ドナー／アクセプター界面における複雑な電子準位接続 (2015)
  • Author(s): 赤池幸紀，G. Heimel, M. Oehzelt, N. Koch
  • Organizer: 第７６回応用物理学会秋季学術講演会
  • Place of Presentation: 名古屋国際会議場
  • Year and Date: 2015-09-13
• [Remarks] 東京理科大学 教員プロフィール
  • URL: https://www.tus.ac.jp/fac_grad/p/achievement.php?6b7b
• [Remarks] Kouki Akaike's Homepage
  • URL: http://koukisite.web.fc2.com/