Novel valley functionalities in transition metal dichalcogenide monolayers

• Project/Area Number: 16K13618
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Nanostructural physics
• Research Institution: Nagoya University
• Principal Investigator: Takenobu Taishi 名古屋大学, 工学研究科, 教授 (70343035)
• Research Collaborator: ITO Hiroshi ; TANAKA Hisaaki ; PU Jiang ; SAKANOUE Tomo ; TANAKA Kazuhiro ; GOTO Ayako ; KANAHASHI Kaito ; MATSUKI Keichiro ; TAKEKOSHI Naoya ; ZHANG Tingwu ; MADA Hiroaki ; EURA Yusuke ; EDAGAWA Yusuke ; HORI Takasumi ; MIYAZAKI Masumi ; WAKAMATSU Ayato ; MITAMURA Masaya ; KOZAWA Daichi ; ICHIMURA Ryo ; KAWAMURA Shinya ; TSUBOI Yuki ; NAGATSU Go ; HIRAI Tomoaki ; MATSUOKA Hirofumi ; ISOAI Haruka ; YAMADA Tomoyuki ; Tempia Juliette ; YOSHINA Shinji
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 物性実験 / ナノデバイス / 複合材料 / マイクロ・ナノデバイス / 分子性固体 / 複合材料・物性 / 原子層 / 電気２重層

Outline of Final Research Achievements

Direct bandgap and unique electronic structure in monolayer transition metal dichalcogenides (TMDCs) provides a platform for exploring novel valley functionalities optoelectronic functionalities. In this proposal, we fabricated large-area sample and developed the electrochemical method to dope both holes and electrons. Finally, we performed several valley functionalities, such as (i) electric-field induced metal-insulator transition, (ii) circularly polarized EL emission, and (iii) optimization of thermopower conversion efficiency.

Research Products

• [Int'l Joint Research] KAUST(サウジアラビア)
• [Int'l Joint Research] Feng Chia University(台湾)
• [Int'l Joint Research] KAUST(サウジアラビア)
• [Int'l Joint Research] Feng Chia University(台湾)
• [Journal Article] Chemical hole doping into large-area transition metal dichalcogenide monolayers using boron-based oxidant (2018)
  • Author(s): Hirofumi Matsuoka, Kaito Kanahashi, Naoki Tanaka, Yoshiaki Shoji, Lain‐Jong Li, Jiang Pu, Hiroshi Ito, Takanori Fukushima, Taishi Takenobu
  • Journal Title: Japanese Journal of Applied Physics Volume: 57 Issue: 2S2 Pages: 1-4
  • DOI: 10.7567/jjap.57.02cb15
  • NAID: 210000148662
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Self-Aligned and Scalable Growth of Monolayer WSe2-MoS2 lateral heterojunctions (2018)
  • Author(s): M-Y. Li, J. Pu, J-K. Huang, Y. Miyauchi, K. Matsuda, T. Takenobu, and L-J Li
  • Journal Title: Advanced Functional Materials Volume: 28 Issue: 17 Pages: 1706860-1706860
  • DOI: 10.1002/adfm.201706860
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A versatile and simple approach to generate light emission in semiconductors mediated by electric double layers (2017)
  • Author(s): Jiang Pu, Taiyo Fujimoto, Yuki Ohasi, Shota Kimura, Chang-Hsiao Chen, Lain-Jong Li, Tomo Sakanoue, Taishi Takenobu
  • Journal Title: Advanced Materials Volume: 印刷中 Issue: 24 Pages: 1606918-1606918
  • DOI: 10.1002/adma.201606918
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Enhanced thermoelectric power in two-dimensional transition metal dichalcogenide monolayers (2016)
  • Author(s): J. Pu, K. Kanahashi, N. T. Cuong, C-H. Chen, L-J. Li, S. Okada, H. Ohta, and T. Takenobu
  • Journal Title: Phys. Rev. B Volume: 94 Issue: 1 Pages: 014312-014312
  • DOI: 10.1103/physrevb.94.014312
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Direct observation of electrically induced Pauli paramagnetism in single-layer graphene using ESR spectroscopy (2016)
  • Author(s): N. Fujita, D. Matsumoto, Y. Sakurai, K. Kawahara, H. Ago, T. Takenobu, K. Marumoto
  • Journal Title: Scientific Reports Volume: 6 Issue: 1 Pages: 34966-34966
  • DOI: 10.1038/srep34966
  • NAID: 120007129349
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Photodetection in p-n junctions formed by electrolyte-gated transistors of two-dimensional crystals (2016)
  • Author(s): Daichi Kozawa, Jiang Pu, Ryo Shimizu, Shota Kimura, Ming-Hui Chiu, Keiichiro Matsuki, Yoshifumi Wada, Tomo Sakanoue, Yoshihiro Iwasa, Lain-Jong Li, Taishi Takenobu
  • Journal Title: Appl. Phys. Lett. Volume: 109 Issue: 20 Pages: 201107-201107
  • DOI: 10.1063/1.4967173
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] Functional devises of transition metal dichalcogenide monolayers (2018)
  • Author(s): Taishi Takenobu
  • Organizer: ITC2018
  • Int'l Joint Research / Invited
• [Presentation] 多結晶遷移金属ダイカルコゲナイド単層膜の電流励起発光イメージング (2018)
  • Author(s): 松岡 拓史、蒲 江、Li Lain-Jong、坂上 知、竹延 大志
  • Organizer: 第65回応用物理学会春季学術講演会
• [Presentation] 単層MoS2/WSe2面内ヘテロ接合発光ダイオード (2018)
  • Author(s): 蒲 江、Ming-Yang Li、Jing-Kai Huang、宮内 雄平、松田 一成、Lain-Jong Li、竹延 大志
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] 有機デバイスにおける界面制御 (2017)
  • Author(s): Taishi Takenobu
  • Organizer: 電子情報通信学会 2017年総合大会
  • Place of Presentation: 名城大学（愛知県名古屋市）
  • Year and Date: 2017-03-22
  • Invited
• [Presentation] 多結晶MoS2単層膜における電界誘起金属-絶縁体転移 (2017)
  • Author(s): 蒲 江, 枝川 祐介, 三田村 昌哉, 河合 英輝, Lain-Jong Li , 蓬田 陽平, 柳 和宏, 伊東 裕, 竹延 大志
  • Organizer: 日本物理学会 第72回年次大会
  • Place of Presentation: 大阪大学 豊中キャンパス（大阪府豊中市）
  • Year and Date: 2017-03-17
• [Presentation] Thermoelectric Properties in Two-Dimensional Transition Metal Dichalcogenide Monolayers and One-Dimensional Metal Complexes (2017)
  • Author(s): K. Kanahashi, J. Pu, N. T. Cuong, C.-H. Chen, L.-J. Li, S. Okada, H. Ohta, S. Takaishi, T. Takenobu
  • Organizer: The 3rd International Symposium on π-System Figuration
  • Place of Presentation: 名古屋大学（愛知県名古屋市）
  • Year and Date: 2017-01-27
  • Int'l Joint Research
• [Presentation] Electric Double Layer Functionalization of Large-Area Transition Metal Dichalcogenide (2017)
  • Author(s): Taishi Takenobu
  • Organizer: EU Flagship-Japan Second Workshop
  • Int'l Joint Research / Invited
• [Presentation] Thermoelectric Energy Conversion Optimized by Electrolyte Gating (2017)
  • Author(s): Taishi Takenobu
  • Organizer: 231st ECS MEETING
  • Int'l Joint Research / Invited
• [Presentation] 電解質を用いた原子層材料の物性研究 (2017)
  • Author(s): 竹延 大志
  • Organizer: The 7th Fullerenes-Nanotubes-Graphene Young Researcher Meeting
  • Invited
• [Presentation] 2次元カルコゲナイドの電流励起発光 (2017)
  • Author(s): 竹延 大志
  • Organizer: 日本物理学会
  • Invited
• [Presentation] 遷移金属ダイカルコゲナイドを用いた円偏光発光素子 (2017)
  • Author(s): 竹延 大志
  • Organizer: 応用物理学会関西支部平成29年度第2回講演会
  • Invited
• [Presentation] Modulation of Thermoelectric Performance by Using Electrolyte Gating Method (2017)
  • Author(s): Kaito Kanahashi, Jiang Pu, Lain-Jong Li, Masatou Ishihara, Masataka Hasegawa, Yong-Young Noh, Hiromichi Ohta, Taishi Takenobu
  • Organizer: 2017 International Conference on Solid State Devices and Materials
  • Int'l Joint Research
• [Presentation] Chemical Hole Doping into Atomically Thin Materials Using Boron-Based Oxidant (2017)
  • Author(s): H. Matsuoka, K. Kanahashi, N. Tanaka, Y. Shoji, M. Ishihara, M. Hasegawa, L.-J. Li, J. Pu, H. Ito, T. Fukushima, and T. Takenobu
  • Organizer: The 6th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies (EM-Nano 2017)
• [Presentation] 大面積MoS2単層膜における電界誘起金属-絶縁体転移 (2017)
  • Author(s): 蒲 江，山田 知之, Lain-Jong Li, 松田 達磨, 蓬田 陽平, 柳 和宏, 伊東 裕, 竹延 大志
  • Organizer: 応用物理学会
• [Presentation] 電解質を用いた単層遷移金属ダイカルコゲナイド発光素子 (2017)
  • Author(s): 蒲 江, Wenjin Zhang, 松岡 拓史, 小林 佑, 高口 裕平, 宮田 耕充 Lain-Jong Li, 松田 一成, 宮内 雄平, 竹延 大志
  • Organizer: 日本物理学会
• [Presentation] Electric Double Layer Functionalization of Large-Area Transition Metal Dichalcogenide Monolayer Films (2016)
  • Author(s): Taishi Takenobu
  • Organizer: Singapore International Chemistry Conference (SICC9)
  • Place of Presentation: National University of Singapore, Lower Kent Ridge Road, Singapore
  • Year and Date: 2016-12-11
  • Int'l Joint Research / Invited
• [Presentation] Electric Double Layer Transistors of Transition Metal Dichalcogenide Monolayer Films (2016)
  • Author(s): Taishi Takenobu
  • Organizer: The 2016 Fall Meeting of the Materials Research Society
  • Place of Presentation: Hynes Convention Center, Boston, Massachusetts, U.S.A.
  • Year and Date: 2016-11-27
  • Int'l Joint Research / Invited
• [Presentation] Insulator-to-Metal transition in polycrystalline MoS2 films induced by electric double layer gating (2016)
  • Author(s): Y. Edagawa, J. Pu, T. Osakabe, L.-J. Li, H. Ito, T. Takenobu
  • Organizer: the 2016 International Conference on Solid State Devices and Materials (SSDM2016)
  • Place of Presentation: つくば国際会議場（茨城県つくば市）
  • Year and Date: 2016-09-26
  • Int'l Joint Research
• [Presentation] 大面積原子層薄膜を用いた新機能素子 (2016)
  • Author(s): Taishi Takenobu
  • Organizer: 第65 回高分子討論会
  • Place of Presentation: 神奈川大学 横浜キャンパス（神奈川県横浜市）
  • Year and Date: 2016-09-14
  • Invited
• [Presentation] Ion-driven light-emitting devices (2016)
  • Author(s): Taishi Takenobu
  • Organizer: FET Workshop
  • Place of Presentation: Ruttgers Bay Lake Lodge, Minnesota, U.S.A.
  • Year and Date: 2016-09-07
  • Int'l Joint Research / Invited
• [Presentation] Ion-gating control of optical properties in 2D semiconductors (2016)
  • Author(s): Taishi Takenobu
  • Organizer: NPO2016, The Fifth International Workshop on Nanocarbon Photonics and Optoelectronics
  • Place of Presentation: Holiday Club Saimaa, Imatra, Finland
  • Year and Date: 2016-08-01
  • Int'l Joint Research / Invited
• [Presentation] 電解質を用いた新しい機能性素子 (2016)
  • Author(s): Taishi Takenobu
  • Organizer: 第3回有機・無機エレクトロニクスシンポジウム
  • Place of Presentation: 石川県政記念 しいのき迎賓館（石川県金沢市）
  • Year and Date: 2016-07-15
  • Invited
• [Presentation] Transition Metal Dichalcogenide Monolayers as Quantum Wells (2016)
  • Author(s): Taishi Takenobu
  • Organizer: 229th ECS MEETING
  • Place of Presentation: Hilton Bayfront, San Diego, California, U.S.A.
  • Year and Date: 2016-05-29
  • Int'l Joint Research / Invited
• [Presentation] Enhanced thermoelectric power in two-dimensional transition metal dichalcogenide monolayers (2016)
  • Author(s): J. Pu, K. Kanahashi, N. T. Cuong, C.-H. Chen, L.-J. Li, S. Okada, H. Ohta, T. Takenobu
  • Organizer: 2nd International Symposium on π-System Figuration
  • Place of Presentation: 浦和コミュニティセンター（埼玉県さいたま市）
  • Year and Date: 2016-04-14
  • Int'l Joint Research