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Investigation of fascinating conductivity at superstructure interfaces using oxide atomic sheets

Research Project

Project/Area Number 16H06116
Research Category

Grant-in-Aid for Young Scientists (A)

Allocation TypeSingle-year Grants
Research Field Inorganic materials/Physical properties
Research InstitutionNational Institute for Materials Science

Principal Investigator

Ohsawa Takeo  国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, 主任研究員 (00450289)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥26,130,000 (Direct Cost: ¥20,100,000、Indirect Cost: ¥6,030,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2016: ¥22,750,000 (Direct Cost: ¥17,500,000、Indirect Cost: ¥5,250,000)
Keywords薄膜・表面界面物性 / 酸化物薄膜 / 原子シート / ホール効果 / 光電子分光 / 走査型トンネル顕微鏡 / エピタキシャル成長 / 表面・界面物性 / 酸化物エレクトロニクス
Outline of Final Research Achievements

Transition-metal oxides exhibit a broad range of functionalities that is not observed in conventional semiconductors. Recent progress in epitaxial growth of oxide films enables artificial synthesis of low-dimensional interfacial structures and therefore we can expect novel electronic properties. In this research, we investigated a TiO2 atomic sheet spontaneously formed on a LaAlO3/SrTiO3 heterostructures to reveal how the sheet can contribute to the electronic properties.
Epitaxial growth of the heterostructures on atomically-ordered SrTiO3 substrates resulted in the decrease of critical thickness for electrical conductivity and accumulation of higher electron density at the interfaces. These results clarified the impact of the TiO2 atomic sheet on the electronic transport properties.

Academic Significance and Societal Importance of the Research Achievements

気相合成時に自発的に形成されるTiO2原子シートは、構造的特長を有していることから、構造の特異性や対称性によって、通常の3次元結晶とは異なる性質を利用した新たなエレクトロニクスデバイス創製や電子素子を開発する指導原理を創出することに繋がると期待できる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (47 results)

All 2019 2018 2017 2016

All Journal Article (18 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 18 results,  Open Access: 2 results,  Acknowledgement Compliant: 1 results) Presentation (28 results) (of which Int'l Joint Research: 5 results,  Invited: 2 results) Book (1 results)

  • [Journal Article] IR photoresponse characteristics of Mg2Ge pn-junction photodiodes fabricated by rapid thermal annealing2019

    • Author(s)
      El-Amir Ahmed A.M.、Ohsawa Takeo、Oshima Yuichi、Nakamura Masaru、Shimamura Kiyoshi、Ohashi Naoki
    • Journal Title

      Journal of Alloys and Compounds

      Volume: 787 Pages: 578-584

    • DOI

      10.1016/j.jallcom.2019.02.147

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Ecofriendly Mg2Si-based photodiode for short-wavelength IR sensing2019

    • Author(s)
      El-Amir Ahmed A.M.、Ohsawa Takeo、Nabatame Toshihide、Ohi Akihiko、Wada Yoshiki、Nakamura Masaru、Fu Xiuwei、Shimamura Kiyoshi、Ohashi Naoki
    • Journal Title

      Materials Science in Semiconductor Processing

      Volume: 91 Pages: 222-229

    • DOI

      10.1016/j.mssp.2018.11.033

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Impact of a surface TiO2 atomic sheet on the electronic transport properties of LaAlO3/SrTiO3 heterointerfaces2018

    • Author(s)
      T. Ohsawa, M. Saito, R. Shimizu, K. Iwaya, S. Shiraki, Y. Ikuhara, and T. Hitosugi
    • Journal Title

      Applied Physics Letters

      Volume: 113 Issue: 14 Pages: 141602-141602

    • DOI

      10.1063/1.5046876

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Electronic Transport Properties Governed by Polarity Control through Tailoring of ZnO Bilayer Structures2018

    • Author(s)
      Ohsawa Takeo、Tsunoda Kei、Yamagata Yoshihito、Dierre Benjamin、Grachev Sergey、Montigaud Herve、Ishigaki Takamasa、Ohashi Naoki
    • Journal Title

      Crystal Growth & Design

      Volume: 18 Issue: 10 Pages: 5824-5831

    • DOI

      10.1021/acs.cgd.8b00396

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Growth-Parameter Dependence of Polarity and Electronic Transports in ZnO Thin Films Deposited by Magnetron Sputtering2018

    • Author(s)
      Ohsawa Takeo、Tsunoda Kei、Dierre Benjamin、Grachev Sergey、Montigaud Herve、Ishigaki Takamasa、Ohashi Naoki
    • Journal Title

      physica status solidi (a)

      Volume: 215 Issue: 16 Pages: 1700838-1700838

    • DOI

      10.1002/pssa.201700838

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Controlling the electrical conductivity of ternary wurtzite-type and metastable β-AgGaO2 by impurity doping2018

    • Author(s)
      Nagatani Hiraku、Suzuki Issei、Takemura Sayuri、Ohsawa Takeo、Ohashi Naoki、Fujimoto Shinji、Omata Takahisa
    • Journal Title

      AIP Advances

      Volume: 8 Issue: 8 Pages: 085203-085203

    • DOI

      10.1063/1.5046361

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Preparation and some properties of Mg2Si0.53Ge0.47 single crystal and Mg2Si0.53Ge0.47 pn-junction diode2018

    • Author(s)
      El-Amir Ahmed A. M.、Ohsawa Takeo、Matsushita Yoshitaka、Wada Yoshiki、Shimamura Kiyoshi、Ohashi Naoki
    • Journal Title

      AIP Advances

      Volume: 8 Issue: 11 Pages: 115005-115005

    • DOI

      10.1063/1.5056221

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Atomic-scale visualization of oxide thin-film surfaces2018

    • Author(s)
      Iwaya Katsuya、Ohsawa Takeo、Shimizu Ryota、Okada Yoshinori、Hitosugi Taro
    • Journal Title

      Science and Technology of Advanced Materials

      Volume: 19 Issue: 1 Pages: 282-290

    • DOI

      10.1080/14686996.2018.1442616

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Potential barrier formed at domain boundaries in twinned tetragonal BaTiO3 single crystals2017

    • Author(s)
      Ohsawa Takeo、Hirose Sakyo、Ohashi Naoki
    • Journal Title

      Applied Physics Letters

      Volume: 110 Issue: 1 Pages: 011604-011604

    • DOI

      10.1063/1.4972849

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Crystalline polarity of ZnO thin films deposited under dc external bias on various substrates2017

    • Author(s)
      Ohsawa Takeo、Tsunoda Kei、Dierre Benjamin、Zellhofer Caroline、Grachev Sergey、Montigaud Herve、Ishigaki Takamasa、Ohashi Naoki
    • Journal Title

      Journal of Crystal Growth

      Volume: 463 Pages: 38-45

    • DOI

      10.1016/j.jcrysgro.2017.01.048

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Solvent-mediated purification of hexa-molybdenum cluster halide, Cs2[Mo6Cl14] for enhanced optical properties2017

    • Author(s)
      Saito Norio、Lemoine Pierric、Cordier Stephane、Wada Yoshiki、Ohsawa Takeo、Saito Noriko、Grasset Fabien、Cross Jeffrey Scott、Ohashi Naoki
    • Journal Title

      CRYSTENGCOMM

      Volume: 19 Issue: 40 Pages: 6028-6038

    • DOI

      10.1039/c7ce01440f

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Lattice and Valence Electronic Structures of Crystalline Octahedral Molybdenum Halide Clusters-Based Compounds, Cs2[Mo6X14] (X = Cl, Br, I), Studied by Density Functional Theory Calculations2017

    • Author(s)
      Saito Norio、Cordier Stephane、Lemoine Pierric、Ohsawa Takeo、Wada Yoshiki、Grasset Fabien、Cross Jeffrey S.、Ohashi Naoki
    • Journal Title

      Inorganic Chemistry

      Volume: 56 Issue: 11 Pages: 6234-6243

    • DOI

      10.1021/acs.inorgchem.7b00265

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Transparent tantalum cluster-based UV and IR blocking electrochromic devices2017

    • Author(s)
      Renaud A.、Wilmet M.、Truong T. G.、Seze M.、Lemoine P.、Dumait N.、Chen W.、Saito N.、Ohsawa T.、Uchikoshi T.、Ohashi N.、Cordier S.、Grasset F.
    • Journal Title

      Journal of Materials Chemistry C

      Volume: 5 Issue: 32 Pages: 8160-8168

    • DOI

      10.1039/c7tc01964e

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Metallic versus Semiconducting SWCNT Chemiresistors: A Case for Separated SWCNTs Wrapped by a Metallosupramolecular Polymer2017

    • Author(s)
      Ishihara Shinsuke、O’Kelly Curtis J.、Tanaka Takeshi、Kataura Hiromichi、Labuta Jan、Shingaya Yoshitaka、Nakayama Tomonobu、Ohsawa Takeo、Nakanishi Takashi、Swager Timothy M.
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 9 Issue: 43 Pages: 38062-38067

    • DOI

      10.1021/acsami.7b12992

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Simulation of crystal and electronic structures of octahedral molybdenum cluster complex compound Cs<sub>2</sub>[Mo<sub>6</sub>Cl<sub>14</sub>] using various DFT functionals2017

    • Author(s)
      Saito Norio、Lemoine Pierric、Cordier Stephane、Ohsawa Takeo、Wada Yoshiki、Grasset Fabien、Cross Cross Jeffrey、Ohashi Naoki
    • Journal Title

      Journal of the Ceramic Society of Japan

      Volume: 125 Issue: 10 Pages: 753-759

    • DOI

      10.2109/jcersj2.17039

    • NAID

      130006110748

    • ISSN
      1348-6535, 1882-0743
    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Negligible Sr segregation on SrTiO3 (001) √13 x √13 reconstructed surfaces2016

    • Author(s)
      Takeo Ohsawa, Ryota Shimizu, Katsuya Iwaya, Susumu Shiraki and Taro Hitosugi
    • Journal Title

      Appl. Phys. Lett.

      Volume: 108 Issue: 16 Pages: 161603-161603

    • DOI

      10.1063/1.4947441

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Isotope tracer investigation and ab-initio simulation of anisotropic hydrogen transport and possible multi-hydrogen centers in tin dioxide2016

    • Author(s)
      K. Watanabe, I. Sakaguchi, M. Hashiguchi, N. Saito, E. Ross, H. Haneda, T. Ohsawa, N. Ohashi
    • Journal Title

      Journal of Applied Physics

      Volume: 119 Issue: 22 Pages: 225704-225704

    • DOI

      10.1063/1.4953387

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Theoretical and experimental determination of the crystal structures of cesium?molybdenum chloride2016

    • Author(s)
      Saito Norio、Wada Yoshiki、Lemoine Pierric、Cordier Stephane、Grasset Fabien、Ohsawa Takeo、Saito Noriko、Cross Jeffrey S.、Ohashi Naoki
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 55 Issue: 7 Pages: 075502-075502

    • DOI

      10.7567/jjap.55.075502

    • NAID

      210000146761

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed
  • [Presentation] LaAlO3/SrTiO3界面の電子輸送特性におけるTiO2 表面原子シートの効果2018

    • Author(s)
      大澤 健男、白木 將、清水 亮太、一杉 太郎
    • Organizer
      日本セラミックス協会 2019年年会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Investigation on electronic Structure at metal/oxide interfaces2018

    • Author(s)
      大橋 直樹、廣瀬 左京、大澤 健男、上田 茂典
    • Organizer
      43RD INTERNATIONAL CONFERENCE AND EXPOSITION ON ADVANCED CERAMICS AND COMPOSITES
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] ZnO/Ag 接合の加熱処理における界面電子状態の評価2018

    • Author(s)
      山形 栄人、大澤 健男 、保坂 拓己、Herve Montigaud、石垣 隆正、大橋 直樹
    • Organizer
      第66回応用物理学会春季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Electrical and optical properties of Zn3N2 thin films2018

    • Author(s)
      Yong Wang, Takeo Ohsawa, Naoki Ohashi
    • Organizer
      第66回応用物理学会春季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Electrical properties of non-degenerate ZnSnN2 thin films grown by non-equilibrium deposition2018

    • Author(s)
      Yong Wang, Takeo Ohsawa, Naoki Ohashi
    • Organizer
      第66回応用物理学会春季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Ag/ZnO接合薄膜の加熱処理における界面電子状態評価2018

    • Author(s)
      山形 栄人、大澤 健男 、保坂 拓己、Sergey Grachev、Herve Montigaud、石垣 隆正、大橋 直樹
    • Organizer
      第57回セラミックス基礎科学討論会
    • Related Report
      2018 Annual Research Report
  • [Presentation] IR photoresponse characteristics of Mg2Si pn-junction diode fabricated by RTA2018

    • Author(s)
      エルアミル アアハメド モハメド エルサイド アハメド、大澤 健男、生田目 俊秀、大井 暁彦、和田 芳樹、中村 優 、島村 清史、大橋 直樹
    • Organizer
      第47回結晶成長国内会議
    • Related Report
      2018 Annual Research Report
  • [Presentation] チタン酸ストロンチウムの欠陥と誘電特性に関するショットキー接合からの検討2018

    • Author(s)
      大橋 直樹、廣瀬 左京、上田 茂典、大澤 健男
    • Organizer
      第38 回エレクトロセラミックス研究討論会
    • Related Report
      2018 Annual Research Report
  • [Presentation] スパッタ粒子の入射角度に着目した酸化亜鉛薄膜成長とその評価2018

    • Author(s)
      保坂 拓己、山形 栄人、大澤 健男、Sergey Grachev、Herve Montigaud、石垣 隆正、大橋 直樹
    • Organizer
      第38 回エレクトロセラミックス研究討論会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 加熱処理によるZnO/Ag/ZnO薄膜の界面特性評価2018

    • Author(s)
      山形 栄人、大澤 健男、保坂 拓己、Sergey Grachev、Herve Montigaud、石垣 隆正、大橋 直樹
    • Organizer
      第38 回エレクトロセラミックス研究討論会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 角度制御型マグネトロンスパッタリング装置を用いた 酸化亜鉛薄膜の作製と成膜条件の検討2018

    • Author(s)
      保坂 拓己、山形 栄人、大澤 健男、Sergey Grachev、Herve Montigaud、石垣 隆正、大橋 直樹
    • Organizer
      日本セラミックス協会第31回秋季シンポジウム
    • Related Report
      2018 Annual Research Report
  • [Presentation] 角度制御型マグネトロンスパッタリング装置を用いた 酸化亜鉛薄膜の作製と成膜条件の検討2018

    • Author(s)
      保坂 拓己、山形 栄人、大澤 健男、Sergey Grachev、Herve Montigaud、石垣 隆正、大橋 直樹
    • Organizer
      第79回応用物理学会秋季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Electronic States at Buried Metals/SrTiO3 Schottky Junctions Studied by HAXPES2017

    • Author(s)
      Takeo Ohsawa, Sakyo Hirose, Shigenori Ueda, Naoki Ohashi
    • Organizer
      7th International Conference on Hard X-Ray Photoelectron Spectroscopy
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Valence Band DOS of Wide-gap compounds Studied by HAXPES Utilizing Polarized X-ray and DFT simulations2017

    • Author(s)
      Naoki Ohashi, Takeo Ohsawa, Shigenori Ueda
    • Organizer
      7th International Conference on Hard X-Ray Photoelectron Spectroscopy
    • Related Report
      2017 Annual Research Report
  • [Presentation] 極性制御したZnO薄膜を用いたZnO/Si 接合の特性評価2017

    • Author(s)
      大澤 健男, 山形 栄人, 石垣 隆正, 大橋 直樹
    • Organizer
      第78回 応用物理学会 秋季学術講演会
    • Related Report
      2017 Annual Research Report
  • [Presentation] ドメインを導入したBaTiO3単結晶の異方的電気伝導性と局所電子状態2017

    • Author(s)
      大澤 健男
    • Organizer
      透明酸化物光・電子材料第166委員会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 極性制御した酸化亜鉛薄膜の成長,電子状態および接合特性2017

    • Author(s)
      山形 栄人、大澤 健男、Sergey Grachev、Herve Montigaud、石垣隆正、大橋直樹
    • Organizer
      第37回エレクトロセラミックス研究討論会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Growth, Electronic States, and Junction Properties of Polarity-Controlled ZnO Thin Films on Silicon Substrates2017

    • Author(s)
      Yoshihito Yamagata, Takeo Ohaswa, Sergey Grachev, Herve Motigaud, Takamasa Ishigaki, Naoki Ohashi
    • Organizer
      IUMRS-ICAM 2017
    • Related Report
      2017 Annual Research Report
  • [Presentation] Impurities, Defects, and Electronic Transport Properties in Semiconducting ZnO Single Crystals2017

    • Author(s)
      Takeo Ohsawa, Naoki Ohashi
    • Organizer
      IUMRS-ICAM 2017
    • Related Report
      2017 Annual Research Report
  • [Presentation] Defect and hydrogen impurity in zinc oxide studied with various single crystals2017

    • Author(s)
      Naoki Ohashi, Takeo Ohsawa, Isao Sakaguchi
    • Organizer
      EMRS 2017 Fall meeting
    • Related Report
      2017 Annual Research Report
  • [Presentation] Impurities, Polarity, and Electronic Transport Properties of ZnO Crystals and Films2017

    • Author(s)
      Takeo Ohsawa, Naoki Ohashi
    • Organizer
      STAC-10
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 元素戦略の視点で見た酸化物中の欠陥・不純物の振る舞い2017

    • Author(s)
      大橋 直樹, 大澤 健男, 坂口 勲, 上田 茂典.
    • Organizer
      第55回セラミックス基礎科学討論会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Negligible Sr segregation on SrTiO3(001)-(√13×√13)-R33.7° reconstructed surfaces2016

    • Author(s)
      Takeo Ohsawa, Ryota Shimizu, Katsuya Iwaya, Susumu Shiraki, Taro Hitosugi
    • Organizer
      MRS Fall Meeting & Exhibit. 2016
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] TiO2(110)表面のsub-surface Tiサイトにおける余剰電子の強い局在化2016

    • Author(s)
      神坂 英幸, 清水 亮太, 岩谷 克也, 大澤 健男, 白木 将, 長谷川 哲也, 一杉 太郎
    • Organizer
      第10回分子科学討論会
    • Related Report
      2016 Annual Research Report
  • [Presentation] Crystalline Polarity Control of ZnO Thin Films Grown Under External Electric Bias During Magnetron Sputtering2016

    • Author(s)
      Takeo Ohsawa, Kei Tsunoda, Takamasa Ishigaki, Naoki Ohashi
    • Organizer
      The 10th Asian Meeting on Electroceramics
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 水素を添加したZnO単結晶の欠陥と電気特性2016

    • Author(s)
      大澤 健男, 坂口 勲, 上田 茂典, 大橋 直樹.
    • Organizer
      第63回応用物理学会春季学術講演会
    • Related Report
      2016 Annual Research Report
  • [Presentation] 放射光光電子分光による金属・半導体界面の解析2016

    • Author(s)
      大橋 直樹, 廣瀬 左京, 上田 茂典, 大澤 健男, 坂口 勲, 安藤陽, 大串 秀世
    • Organizer
      文部科学省 元素戦略プロジェクト<研究拠点形成型>/大型研究施設
    • Related Report
      2016 Annual Research Report
  • [Presentation] 偏光X 線を用いた放射光光電子分光2016

    • Author(s)
      大橋 直樹, 大澤 健男, 上田 茂典, 鈴木基寛, ウィリアムズ ジェシー ロバート, 館山 佳尚
    • Organizer
      文部科学省 元素戦略プロジェクト<研究拠点形成型>/大型研究施設
    • Related Report
      2016 Annual Research Report
  • [Book] SPring-8/SACLA利用者情報2017

    • Author(s)
      大澤 健男、上田 茂典、鈴木基寛、大橋 直樹
    • Total Pages
      5
    • Publisher
      JASRI
    • Related Report
      2017 Annual Research Report

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Published: 2016-04-21   Modified: 2020-03-30  

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