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Chemical defects of gallium oxide at low oxygen partial pressure and doping for sol-gel thin films

Research Project

Project/Area Number 17K06791
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Inorganic materials/Physical properties
Research InstitutionGifu University

Principal Investigator

Ohya Yutaka  岐阜大学, 工学部, 教授 (80167311)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords酸化ガリウム / 電気伝導度 / 格子欠陥 / 酸化物半導体 / 電気伝導 / 転位 / 酸素分圧依存性 / ドーピング / 結晶化学 / イオン結晶
Outline of Final Research Achievements

The electrical conductivity of porous and high-purity β-Ga2O3 ceramics was measured as a function of oxygen partial pressure, po2, at 700 to 900℃. In the high po2 range, the conductivity was proportional to about -1/4th power of po2, while in the lower po2 range less than about 10^-5 atm its exponent was -0.1 to -0.13. This suggests that different types of defects were formed at high and low po2. The point defect of doubly ionized interstitial gallium ion causes the exponent of -1/4, the same value of the experiment in high po2. When po2 was changed, the electrical conductivity first changed sharply, followed by a slow change, suggesting a certain migrations of point defects, and so on. Many edge dislocations, with density of about 10^12 /cm2, were observed after long time duration in reducing atmosphere at 800℃.

Academic Significance and Societal Importance of the Research Achievements

酸化ガリウムは次世代のパワーデバイス用の半導体基板として注目され、研究されている。半導体基板は高品質の単結晶を作製することが不可欠であるが、どの様な欠陥が生成し、これが電気的性質に影響を及ぼしているかについて明らかにする必要がある。この研究では酸化物半導体の基礎となる欠陥の生成について電気伝導度の酸素分圧依存性についての実験を行った。その結果は酸素分圧が高いときには2価に帯電した格子間ガリウムが重要な役割を果たしていることが分かった。さらに非常に高密度の刃状転移が存在しており、これが高品質な単結晶の合成に影響を及ぼすことも示された。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (17 results)

All 2020 2019 2018 2017

All Journal Article (13 results) (of which Int'l Joint Research: 7 results,  Peer Reviewed: 12 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Reaction of Molten Aluminum with MgO and Formation of MgAl<sub>2</sub>O<sub>4</sub> Spinel at 1000°C2020

    • Author(s)
      Ohya Yutaka、Ishii Yusuke、Ban Takayuki
    • Journal Title

      MATERIALS TRANSACTIONS

      Volume: 61 Issue: 2 Pages: 339-345

    • DOI

      10.2320/matertrans.MT-M2019220

    • NAID

      130007790219

    • ISSN
      1345-9678, 1347-5320
    • Year and Date
      2020-02-01
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Size controlled synthesis of well-distributed nano-silver on hydroxyapatite using alkanolamine compounds2020

    • Author(s)
      Labanni Arniati、Zulhadjri、Handayani Dian、Ohya Yutaka、Arief Syukri
    • Journal Title

      Ceramics International

      Volume: 46 Issue: 5 Pages: 5850-5855

    • DOI

      10.1016/j.ceramint.2019.11.035

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Enhanced antiferromagnetic resonance linewidth in NiO/Pt and NiO/Pd2020

    • Author(s)
      Moriyama Takahiro、Hayashi Kensuke、Yamada Keisuke、Shima Mutsuhiro、Ohya Yutaka、Tserkovnyak Yaroslav、Ono Teruo
    • Journal Title

      Physical Review B

      Volume: 101 Issue: 6 Pages: 060402-060402

    • DOI

      10.1103/physrevb.101.060402

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Hydrothermal Synthesis of Layered Perovskite-Structured Metal Oxides and Cesium Tungstate Nanosheets2019

    • Author(s)
      Ban Takayuki、Kaiden Takafumi、Ohya Yutaka
    • Journal Title

      Crystal Growth & Design

      Volume: 19 Issue: 12 Pages: 6903-6910

    • DOI

      10.1021/acs.cgd.9b00515

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The effect of monoethanolamine as stabilizing agent in Uncaria gambir Roxb. mediated synthesis of silver nanoparticles and its antibacterial activity2019

    • Author(s)
      Labanni Arniati、Zulhadjri Zulhadjri、Handayani Dian、Ohya Yutaka、Arief Syukri
    • Journal Title

      Journal of Dispersion Science and Technology

      Volume: - Issue: 10 Pages: 1-8

    • DOI

      10.1080/01932691.2019.1626249

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Preparation of Mesoporous Titania Thin Films and Their Photocatalytic Activity2018

    • Author(s)
      Dwipa Y. Away Romy、Fujii Sota、Ban Takayuki、Ohya Yutaka
    • Journal Title

      Transactions of the Materials Research Society of Japan

      Volume: 43 Issue: 4 Pages: 223-228

    • DOI

      10.14723/tmrsj.43.223

    • NAID

      130007428880

    • ISSN
      1382-3469, 2188-1650
    • Year and Date
      2018-08-01
    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Influence of the negative charge density of metalate nanosheets on their bottom-up synthesis2018

    • Author(s)
      T. Ban, T. Wakita, R. Yokoyama, T. Miyake, Y. Ohya
    • Journal Title

      CrystEngComm

      Volume: 20 Issue: 25 Pages: 3559-3568

    • DOI

      10.1039/c8ce00642c

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Reaction of some oxide ceramics with molten aluminium2018

    • Author(s)
      Ishii Yusuke, Ban Takayuki, Ohya Yutaka
    • Journal Title

      Refractories Worldforum

      Volume: 10 Pages: 43-47

    • Related Report
      2018 Research-status Report
  • [Journal Article] Bottom-up synthesis of aluminophosphate nanosheets by hydrothermal process2018

    • Author(s)
      Ban Takayuki, Iriyama Shota, Ohya Yutaka
    • Journal Title

      Advanced Powder Technology

      Volume: 29 Issue: 3 Pages: 537-542

    • DOI

      10.1016/j.apt.2017.10.013

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Thermal expansion and mechanical properties of self-reinforced aluminum titanate ceramics with elongated grains2017

    • Author(s)
      Ohya Yutaka、Yamamoto Shu、Ban Takayuki、Tanaka Makoto、Kitaoka Satoshi
    • Journal Title

      Journal of the European Ceramic Society

      Volume: 37 Issue: 4 Pages: 1673-1680

    • DOI

      10.1016/j.jeurceramsoc.2016.11.037

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Cation distribution of pseudobrookite-type titanates and their phase stability2017

    • Author(s)
      OHYA Yutaka、KAWAUCHI Yukihiro、BAN Takayuki
    • Journal Title

      Journal of the Ceramic Society of Japan

      Volume: 125 Issue: 9 Pages: 695-700

    • DOI

      10.2109/jcersj2.17086

    • NAID

      130006041570

    • ISSN
      1348-6535, 1882-0743
    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Green Chemistry Formation of Stable Ag Nanoparticles (Agnps) in Isopropanol Solvent2017

    • Author(s)
      Arief Syukri、Hidayani Putri、Aferta Lusi、Zulhadjri Zulhadjri、Ban Takayuki、Ohya Yutaka
    • Journal Title

      Oriental Journal of Chemistry

      Volume: 33 Issue: 1 Pages: 87-91

    • DOI

      10.13005/ojc/330109

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] New Soft Magnetic Material Bonding Approach Using Ceramic Precursors and Ceramic Nanopowder2017

    • Author(s)
      Yun Kyyoul、Yanase Shunji、Ban Takayuki、Ohya Yutaka
    • Journal Title

      IEEE Transactions on Magnetics

      Volume: 53 Issue: 12 Pages: 1-4

    • DOI

      10.1109/tmag.2017.2720139

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 酸化物半導体の電導度の酸素分圧依存性2020

    • Author(s)
      大矢 豊
    • Organizer
      第58回セラミックス基礎科学討論会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Reaction of Some Oxide Ceramics with Molten Aluminum2017

    • Author(s)
      Y. Ohya, Y. Ishii and T. Ban
    • Organizer
      UNITECR (Unified International Technical Conference of Refractories) 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Microstructure development and thermal expansion of aluminum titanate ceramics co-doped with MgO and La2O32017

    • Author(s)
      Takamasa MIZUNO, Takayuki BAN, Yutaka OHYA
    • Organizer
      The 34th International Japan-Korea Seminar on Ceramics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Preparation of Mesoporous Titania Thin Films and It's Photocatalytic Activity2017

    • Author(s)
      Romy Dwipa Y. AWAY, Y. OHYA, S. FUJII, T. BAN
    • Organizer
      IUMRS-ICAM 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2021-02-19  

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