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Behavior of persistently trapped carriers induced by UV-irradiation in doped titanium dioxide single crystals

Research Project

Project/Area Number 24560800
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Physical properties of metals
Research InstitutionYokohama National University

Principal Investigator

SEKIYA takao  横浜国立大学, 工学(系)研究科(研究院), 教授 (60211322)

Project Period (FY) 2012-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords光誘起永続物性 / 輻射緩和 / 二酸化チタン / 不純物ドーピング / 光誘起キャリア / 光物性 / ドーピング
Outline of Final Research Achievements

In UV-irradiated EPR spectra of Al-doped anatase titanium dioxide single crystal, EPR sextuplet due to a hyper fine splitting (hfs) interacting with nuclear spin of doped Al, is observed at temperatures below 80 K. The UV-induced EPR sextuplet signal can be persistently observed in the dark below 80 K. An optical emission due to the recombination of UV-generated and persistently trapped carriers can be observed at around 2.05 eV, when the sample crystal irradiated UV light below 80 K is heated in the dark. In photoluminescence measurement, a broad band is observed at around 2.25 eV. The difference between photoluminescence and emission by persistently trapped carrier recombination is mainly caused by impurity level formed by doped Al. In Nb-doped anatase titanium dioxide single crystal, little change induced by UV-irradiation is observed on optical absorption, EPR spectra and electric conductivity. This indicates UV-induced absence of persistently trapped carriers in Nb-doped crystal.

Report

(4 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • 2012 Research-status Report
  • Research Products

    (15 results)

All 2015 2014 2013 2012 Other

All Journal Article (2 results) (of which Peer Reviewed: 1 results) Presentation (10 results) (of which Invited: 1 results) Remarks (3 results)

  • [Journal Article] Persistent Trapping of Photo-generated Carriers in Colorless Anatase TiO2 Single Crystal2012

    • Author(s)
      T. Sekiya, Y. Takeda, H. Takeda, S. Ohya, T. Kodaira
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 81 Issue: 12 Pages: 124701-124701

    • DOI

      10.1143/jpsj.81.124701

    • NAID

      210000109837

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Alドープanatase型二酸化チタン単結晶の誘起キャリアの輻射緩和2012

    • Author(s)
      中川 勇, 内山裕太, 関谷隆夫
    • Journal Title

      光物性研究会論文集

      Volume: 23 Pages: 133-136

    • Related Report
      2012 Research-status Report
  • [Presentation] ESRからみたAlをドープしたanatase型TiO2単結晶における局所構造2015

    • Author(s)
      田辺裕亮, 加藤光太, 関谷隆夫, 小平哲也
    • Organizer
      第10回ナノテク交流シンポジウム
    • Place of Presentation
      横浜市立大学
    • Year and Date
      2015-03-06
    • Related Report
      2014 Annual Research Report
  • [Presentation] AlドープAnatase型に酸化チタン単結晶中の光誘起キャリアの緩和2015

    • Author(s)
      加藤光太, 田辺裕亮, 関谷隆夫
    • Organizer
      第10回ナノテク交流シンポジウム
    • Place of Presentation
      横浜市立大学
    • Year and Date
      2015-03-06
    • Related Report
      2014 Annual Research Report
  • [Presentation] Nbドープ二酸化チタンAnatase型単結晶の欠陥制御と電気伝導2014

    • Author(s)
      岡田遼介、加藤光太、田辺裕亮、関谷隆夫、小平哲也
    • Organizer
      第25回光物性研究会
    • Place of Presentation
      神戸大学 百年記念会館
    • Year and Date
      2014-12-12 – 2014-12-13
    • Related Report
      2014 Annual Research Report
  • [Presentation] Nbドープ二酸化チタンAnatase型単結晶の電気伝導と欠陥状態2014

    • Author(s)
      岡田遼介, 関谷隆夫
    • Organizer
      日本物理学会2014年秋季大会
    • Place of Presentation
      中部大学春日井キャンパス
    • Year and Date
      2014-09-07 – 2014-09-10
    • Related Report
      2014 Annual Research Report
  • [Presentation] anatase型二酸化チタン単結晶におけるAlドープの効果2014

    • Author(s)
      清水ありさ, 中川勇, 小平哲也, 関谷隆夫
    • Organizer
      第9回ナノテク交流シンポジウム
    • Place of Presentation
      横浜市
    • Related Report
      2013 Research-status Report
  • [Presentation] Anatase型二酸化チタン単結晶中へのNbによるキャリアドーピング2013

    • Author(s)
      岡田遼介, 関谷隆夫
    • Organizer
      日本物理学会2013年秋の分科会
    • Place of Presentation
      徳島市
    • Related Report
      2013 Research-status Report
  • [Presentation] AlドープしたTiO2結晶における紫外線励起スピン種のパルスESR観測2013

    • Author(s)
      秋元郁子, 関谷隆夫
    • Organizer
      電子スピンサイエンス学会
    • Place of Presentation
      大宮市
    • Related Report
      2013 Research-status Report
  • [Presentation] Photo- and Thermoluminescence of Al-doped anatase titanium dioxide single crystal2012

    • Author(s)
      Isamu Nakagawa , Yuta Uchiyama, Takao Sekiya
    • Organizer
      10th International Conference on Excitonic Processes in Condensed Matter
    • Place of Presentation
      オランダ、Groningen
    • Related Report
      2012 Research-status Report
  • [Presentation] Persistent Trapping and Relaxation of UV-generated Carriers in Al-doped Anatase Titanium Dioxide Single Crystal2012

    • Author(s)
      Takao Sekiya, Isamu Nakagawa, Yasuhiro Takeda, and Tetsuya Kodaira
    • Organizer
      1st International Conference on Emerging Advanced Nanomaterials
    • Place of Presentation
      オーストラリア、Brisbane
    • Related Report
      2012 Research-status Report
    • Invited
  • [Presentation] Alドープanatase型二酸化チタン単結晶の誘起キャリアの輻射緩和2012

    • Author(s)
      中川 勇, 内山裕太, 関谷隆夫
    • Organizer
      第23回光物性研究会
    • Place of Presentation
      大阪市
    • Related Report
      2012 Research-status Report
  • [Remarks] 無機酸化物単結晶の作成と電子物性 / 紫外光誘起キャリアの永続的トラップ

    • URL

      http://www.sekiya-lab.ynu.ac.jp/research/anatase.html

    • Related Report
      2014 Annual Research Report
  • [Remarks] 無機酸化物単結晶の作成と電子物性

    • URL

      http://www.sekiya-lab.ynu.ac.jp/research/anatase.html

    • Related Report
      2013 Research-status Report
  • [Remarks] 無機酸化物単結晶の作成と電子物性

    • URL

      http://www.sekiya-lab.ynu.ac.jp/research/anatase.html

    • Related Report
      2012 Research-status Report

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Published: 2013-05-31   Modified: 2019-07-29  

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