Elucidate the electronic functions at organic semiconductor interfaces by means of a precise electronic state evaluation

• Project/Area Number: 26248062
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Device related chemistry
• Research Institution: Institute for Molecular Science
• Principal Investigator: Kera Satoshi 分子科学研究所, 光分子科学研究領域, 教授 (10334202)
• Co-Investigator(Renkei-kenkyūsha): Okudaira Koji 千葉大学, 融合科学研究科, 准教授 (50202023) ; Nakayama Yasuo 千葉大学, 融合科学研究科, 助教 (30451751)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥42,900,000 (Direct Cost: ¥33,000,000、Indirect Cost: ¥9,900,000); Fiscal Year 2017: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000); Fiscal Year 2016: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000); Fiscal Year 2015: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2014: ¥24,960,000 (Direct Cost: ¥19,200,000、Indirect Cost: ¥5,760,000)
• Keywords: 表面物理学 / 有機半導体 / 電子状態 / シンクロトロン放射光 / 光電子分光 / 電荷輸送 / 薄膜構造 / 分子間相互作用 / 表面界面物性 / 準位接合 / 表面・界面物性 / 電荷輸送機構 / 分子性固体 / 自己組織化 / 有機エレクトロニクス / 界面電子状態 / 電子準位接合

Outline of Final Research Achievements

We have studied the electronic structure of organic semiconductor materials and their interfaces related by means of high-sensitive ultraviolet photoelectron spectroscopy and various surface analysis methods and photoelectron spectroscopies using synchrotron facilities. The fine features of the electronic structure are detected by preparing the well-defined molecular monolayer and single crystals of complicated large molecules. A novel research to explore the charge transport mechanism is opened because i) the origin of the organic semiconductor nature is revealed by detecting the gap state and ii) the fine feature of electron-phonon coupling is observed experimentally. We enter an unexplored research area for discussing a modulation of molecular orbital spread based on quasiparticle picture by weak electronic coupling as well as strong electron-phonon coupling of the large molecular groups.

Research Products

• [Int'l Joint Research] イエナ大学/ユーリッヒ研究所/チュービンゲン大学(ドイツ)
• [Int'l Joint Research] ELETTRA放射光施設(イタリア)
• [Int'l Joint Research] 蘇州大学(中国)
• [Int'l Joint Research] ワイツマン研究所(イスラエル)
• [Int'l Joint Research] イエナ大学/ドレスデン工科大学/ユーリッヒ研究所(ドイツ)
• [Int'l Joint Research] ワイツマン研究所(イスラエル)
• [Int'l Joint Research] 蘇州大学(中国)
• [Int'l Joint Research] イエナ大学/フンボルト大学/ユーリッヒ研究所(ドイツ)
• [Int'l Joint Research] 蘇州大学(中国)
• [Int'l Joint Research] ワイツマン研究所(イスラエル)
• [Int'l Joint Research] グラーツ工科大学(オーストリア)
• [Journal Article] Characteristics of Organic-Metal Interaction: A Perspective from Bonding Distance to Orbital Delocalization (2018)
  • Author(s): Kera Satoshi、Hosokai Takuya、Duhm Steffen
  • Journal Title: Journal of the Physical Society of Japan Volume: 87 Issue: 6 Pages: 061008-061008
  • DOI: 10.7566/jpsj.87.061008
  • NAID: 210000134834
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Electronic structure of dipeptides in the gas-phase and as an adsorbed monolayer (2018)
  • Author(s): Guo Cunlan、Sarkar Soumyajit、Refaely-Abramson Sivan、Egger David A.、Bendikov Tatyana、Yonezawa Keiichirou、Suda Yosuke、Yamaguchi Takuma、Pecht Israel、Kera Satoshi、Ueno Nobuo、Sheves Mordechai、Kronik Leeor、Cahen David
  • Journal Title: Phys. Chem. Chem. Phys. Volume: 20 Issue: 10 Pages: 6860-6867
  • DOI: 10.1039/c7cp08043c
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Insight into doping efficiency of organic semiconductors from the analysis of the density of states in n-doped C60 and ZnPc (2018)
  • Author(s): Gaul Christopher、Hutsch Sebastian、Schwarze Martin、Schellhammer Karl Sebastian、Bussolotti Fabio、Kera Satoshi、Cuniberti Gianaurelio、Leo Karl、Ortmann Frank
  • Journal Title: Nature Materials Volume: 17 Issue: 5 Pages: 439-444
  • DOI: 10.1038/s41563-018-0030-8
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Analyzing the n-Doping Mechanism of an Air-Stable Small-Molecule Precursor (2017)
  • Author(s): Schwarze Martin、Naab Benjamin D.、Tietze Max L.、Scholz Reinhard、Pahner Paul、Bussolotti Fabio、Kera Satoshi、Kasemann Daniel、Bao Zhenan、Leo Karl
  • Journal Title: ACS Applied Materials & Interfaces Volume: 10 Issue: 1 Pages: 1340-1346
  • DOI: 10.1021/acsami.7b14034
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Origin and role of gap states in organic semiconductor studied by UPS: as the nature of organic molecular crystals (2017)
  • Author(s): Yang Jin-Peng、Bussolotti Fabio、Kera Satoshi、Ueno Nobuo
  • Journal Title: Journal of Physics D: Applied Physics Volume: 50 Issue: 42 Pages: 423002-423002
  • DOI: 10.1088/1361-6463/aa840f
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Metal-organic interface functionalization via acceptor end groups: PTCDI on coinage metals (2017)
  • Author(s): Franco-Canellas Antoni、Wang Qi、Broch Katharina、Duncan David A.、Thakur Pardeep Kumar、Liu Lijia、Kera Satoshi、Gerlach Alexander、Duhm Steffen、Schreiber Frank
  • Journal Title: Physical Review Materials Volume: 1 Issue: 1
  • DOI: 10.1103/physrevmaterials.1.013001
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Hole-phonon coupling effect on the band dispersion of organic molecular semiconductors (2017)
  • Author(s): Bussolotti F.、Yang J.、Yamaguchi T.、Yonezawa K.、Sato K.、Matsunami M.、Tanaka K.、Nakayama Y.、Ishii H.、Ueno N.、Kera S.
  • Journal Title: Nature Communications Volume: 8 Issue: 1 Pages: 173-179
  • DOI: 10.1038/s41467-017-00241-z
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Significant reduction in the hole-injection barrier by the charge-transfer state formation: Diindenoperylene contacted with silver and copper electrodes (2017)
  • Author(s): Hosokai T.、Yonezawa K.、Yang J.P.、Koswattage K.R.、Kera S.
  • Journal Title: Org Electronics Volume: 49 Pages: 39-44
  • DOI: 10.1016/j.orgel.2017.06.033
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Fermi-level pinning appears upon weak electrode-organic contact without gap states: A universal phenomenon (2017)
  • Author(s): Yang Jin-Peng、Shang Lin-Tai、Bussolotti Fabio、Cheng Li-Wen、Wang Wen-Qing、Zeng Xiang-Hua、Kera Satoshi、Li Yan-Qing、Tang Jian-Xin、Ueno Nobuo
  • Journal Title: Org Electronics Volume: 48 Pages: 172-178
  • DOI: 10.1016/j.orgel.2017.06.005
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Picene thin films on metal surfaces: Impact of molecular shape on interfacial coupling (2017)
  • Author(s): 2.Qi Wang, Qian Xin, Rong-Bin Wang, Martin Oehzelt, Nobuo Ueno, Satoshi Kera, and Steffen Duhm
  • Journal Title: Phys. Status Solidi (RRL) Volume: 印刷中 Issue: 5
  • DOI: 10.1002/pssr.201700012
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Nitrogen Substitution Impacts Organic-Metal Interface Energetics (2016)
  • Author(s): A. Yang, A. Canellas, M. Sato, B. Wang, R.-B. Wang, H. Koike, I. Salzmann, P. K.Thakur, T.-L. Lee, L.-J. Liu, S.Kera, A. Gerlach, K. Kanai, J. Fan, F. Schreiber, and S.Duhm
  • Journal Title: Phys. Rev. B Volume: 94 Issue: 15
  • DOI: 10.1103/physrevb.94.155426
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Quantitative Fermi level tuning in amorphous organic semiconductor by molecular doping: Toward full understanding of the doping mechanism (2016)
  • Author(s): J.P. Yang, W.Q. Wang, F. Bussolotti, L.W. Cheng, Y.Q. Li, S. Kera, J.X. Tang, X.H. Zeng, and N. Ueno
  • Journal Title: Appl. Phys. Lett. Volume: 109 Issue: 9
  • DOI: 10.1063/1.4962052
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Halide-substituted electronic properties of organometal halide perovskite films: direct and inverse photoemission studies (2016)
  • Author(s): C. Li, J. Wei, M. Sato, H. Koike, Z.-Z. Xie, Y.-Q. Li, K. Kanai, S. Kera, N.Ueno, J.X. Tang
  • Journal Title: ACS Applied Materials & Interfaces Volume: 8 Issue: 18 Pages: 11526-11531
  • DOI: 10.1021/acsami.6b02692
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Transient Monolayer Structure of Rubrene on Graphite: Impact on Hole-Phonon Coupling (2016)
  • Author(s): Y. He, F. Bussolotti, Q. Xin, J.P. Yang, S. Kera, N. Ueno, and S.Duhm
  • Journal Title: J. Phys. Chem. C Volume: 120 Issue: 27 Pages: 14568-14574
  • DOI: 10.1021/acs.jpcc.6b04848
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Tuning the work function of GaN with organic molecular acceptors (2016)
  • Author(s): T. Schultz, R. Schlesinger, J. Niederhausen, F. Henneberger, S. Sadofev, S. Blumstengel, A. Vollmer, F. Bussolotti, J.-P. Yang, S. Kera, K. Parvez, N. Ueno, K. Mullen, and N. Koch
  • Journal Title: Physical Review B Volume: 93 Issue: 12
  • DOI: 10.1103/physrevb.93.125309
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Charge transfer states appear in the pi-conjugated pure hydrocarbon molecule on Cu(111) (2016)
  • Author(s): K. Yonezawa, Y. Suda, S. Yanagisawa, T. Hosokai, K. Kato, T. Yamaguchi, H. Yoshida, N. Ueno, and S. Kera
  • Journal Title: Applied Physics Express Volume: 9 Issue: 4 Pages: 045201-045201
  • DOI: 10.7567/apex.9.045201
  • Peer Reviewed
• [Journal Article] Self-Assembly of Tetraphenyldibenzoperiflanthene (DBP) Films on Ag(111) in the Monolayer Regime (2016)
  • Author(s): T. Kirchhuebel, M. Gruenewald, F. Sojka, S. Kera, F. Bussolotti, T. Ueba, N. Ueno, G. Rouille, R. Forker, T. Fritz
  • Journal Title: Langmuir Volume: 32 Issue: 8 Pages: 1981-1987
  • DOI: 10.1021/acs.langmuir.5b04069
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] High-resolution core-level photoemission measurements on the pentacene single crystal surface assisted by photoconduction (2016)
  • Author(s): Y. Nakayama, Y. Uragami, M. Yamamoto, K. Yonezawa, K. Mase, S. Kera, H. Ishii, N. Ueno,
  • Journal Title: Journal of Physics: Condensed Matter Volume: 28 Issue: 9 Pages: 094001-094008
  • DOI: 10.1088/0953-8984/28/9/094001
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Photoelectron spectroscopy on the charge reorganization energy and small polaron binding energy of molecular film (2016)
  • Author(s): S. Kera and N. Ueno
  • Journal Title: Journal of Electron Spectroscopy and Related Phenomena Volume: 204 Pages: 2-11
  • DOI: 10.1016/j.elspec.2015.07.007
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Thickness and Substrate Dependent Thin Film Growth of Picene and Impact on the Electronic Structure (2015)
  • Author(s): T. Hosokai, A. Hinderhofer, F. Bussolotti, K. Yonezawa, C. Lorch, T. Watanabe, A. Vorobiev, Y. Hasegawa, Y. Yamada, Y. Kubozoro, A. Gerlach, S. Kera, F. Schreiber, N. Ueno
  • Journal Title: J. Phys. Chem. C Volume: 119 Issue: 52 Pages: 29027-29037
  • DOI: 10.1021/acs.jpcc.5b10453
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Direct detection of density of gap states in C60 single crystal by photoemission spectroscopy (2015)
  • Author(s): F. Bussolotti, J.P. Yang, M. Hiramoto, T. Kaji, S. Kera, N. Ueno
  • Journal Title: Physical Review B Volume: 92 Issue: 11
  • DOI: 10.1103/physrevb.92.115102
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Interface optimization using diindenoperylene for C60 thin film transistors with high electron mobility and high stability (2014)
  • Author(s): Jin-Peng Yang, Qi-Jun Sun, Keiichiro Yonezawa, Alexander Hinderhofer, Fabio Bussolotti, Xu Gao, Nobuo Ueno, Sui-Dong Wang, and Satoshi Kera
  • Journal Title: Org. Electronics Volume: 15 Issue: 11 Pages: 2749-2755
  • DOI: 10.1016/j.orgel.2014.07.010
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] Tracking a transport charge in organic semiconductor material (2017)
  • Author(s): S. Kera
  • Organizer: 9th International Conference of Electronic Structure and Processes at Molecula-Based Interfaces
  • Int'l Joint Research / Invited
• [Presentation] Tracking charge transport of organic semiconductor material by electronic structure measurement (2017)
  • Author(s): S. Kera
  • Organizer: International Conference of Nano and Giga Challenges in Electronics, Photonics and Renewable Energy
  • Int'l Joint Research / Invited
• [Presentation] Spectroscopic evidence on quasiparticle state of organic semiconductor materials (2017)
  • Author(s): S. Kera
  • Organizer: 2017 Korea-Japan Molecular Science Symposium
  • Int'l Joint Research / Invited
• [Presentation] Tracking charge transport in rubrene single crystal (2017)
  • Author(s): S. Kera
  • Organizer: Workshop on Organic Semiconductors: Charge transport, Doping and Electronic states
  • Place of Presentation: 千葉大学、千葉県、千葉市
  • Int'l Joint Research / Invited
• [Presentation] Mass, momentum and energy of an electron in rubrene single crystal (2016)
  • Author(s): S. Kera
  • Organizer: The 4th Workshop on Physics in Organic Optoelectronics
  • Place of Presentation: 蘇州大学（中国、蘇州）
  • Int'l Joint Research / Invited
• [Presentation] A perspective of quasiparticle state in organic crystals (2016)
  • Author(s): S. Kera
  • Organizer: The 18th International conference on solid states and surfaces (ICSFS18)
  • Place of Presentation: ケムニッツ工科大学（ドイツ、ケムニッツ）
  • Int'l Joint Research / Invited
• [Presentation] Deep insight into electronic states of functional molecular materials (2016)
  • Author(s): S. Kera
  • Organizer: The International Conference on Electronic Materials (ICMRS-ICEM2016)
  • Place of Presentation: サンテック国際会議場（シンガポール、シンガポール）
  • Int'l Joint Research / Invited
• [Presentation] Project Report: Performance optimization of tandem organic optoelectronic devices by interface engineering based on the nature of organic semiconductors (2015)
  • Author(s): Satoshi Kera and Yanqing Li
  • Organizer: 3rd international workshop on physics in organic optelectronics
  • Place of Presentation: 岡崎コンファレンスセンタ、愛知
  • Year and Date: 2015-12-10
  • Int'l Joint Research
• [Presentation] Electronic states of functional molecular materials probed by low-energy excitation (2015)
  • Author(s): S. Kera
  • Organizer: The 62nd AVS (American Vacuum Society) International Symposium and Exhibitio
  • Place of Presentation: SanJose, USA
  • Year and Date: 2015-10-20
  • Int'l Joint Research / Invited
• [Presentation] Impacts of Local/Nonlocal Electron-Phonon Coupling on HOMO Band (2015)
  • Author(s): S. Kera
  • Organizer: The 8th edition of the international workshop on Electronic Structure and Processes at Molecular-Based Interfaces
  • Place of Presentation: Tucson, USA
  • Year and Date: 2015-10-14
  • Int'l Joint Research / Invited
• [Presentation] Electron-phonon coupling in organic semiconductor materials (2015)
  • Author(s): S. Kera
  • Organizer: Japan-Taiwan International Workshop on Spectroscopy and Surface Science
  • Place of Presentation: 千葉大学、千葉
  • Year and Date: 2015-06-01
  • Int'l Joint Research / Invited
• [Presentation] 表面分析法により見えてきた機能性分子材料の特徴 (2015)
  • Author(s): 解良聡
  • Organizer: 第85回表面科学研究会（中部表面科学シンポジウム：有機材料表面研究の最近の動向）
  • Place of Presentation: 名城大学、愛知県
  • Year and Date: 2015-01-31
  • Invited
• [Presentation] 有機固体対応光電子分光ビームラインの構築：BL2Bにおける立ち上げII (2014)
  • Author(s): 解良聡, コスワラゲ ラシカ，中山泰生、奥平 幸司，石井 久夫
  • Organizer: UVSORユーザーミーティング2014
  • Place of Presentation: 岡崎コンファレンスセンター、愛知県
  • Year and Date: 2014-11-14
• [Presentation] Energy distribution and density of gap states at organic-organic interfaces :Physics behind weak interaction (2014)
  • Author(s): Satoshi Kera
  • Organizer: The 2nd Workshop on Physics in Organic Optoelectronics
  • Place of Presentation: Soochow, China
  • Year and Date: 2014-10-28
  • Invited
• [Presentation] Violation of sudden approximation at molecular monolayer interface (2014)
  • Author(s): Satoshi Kera
  • Organizer: SFB 1083-Workshop on Organic/Metal Interfaces
  • Place of Presentation: Marburg, Germany
  • Year and Date: 2014-07-17
  • Invited
• [Presentation] Advanced photoelectron spectroscopies for functional molecular materials (2014)
  • Author(s): Satoshi Kera
  • Organizer: The 7th Japan-Sweden Workshop on Advanced Spectroscopy of Organic Materials for Electronic Applications
  • Place of Presentation: Lund, Sweden
  • Year and Date: 2014-07-08 – 2014-07-13
  • Invited
• [Remarks]
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