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In-situ measurements of the irradiation effects in semiconductors under high energy ion irradiation

Research Project

Project/Area Number 14380233
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear engineering
Research InstitutionTohoku University (2003-2004)
The University of Tokyo (2002)

Principal Investigator

ASAI Keisuke  Tohoku University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (60231859)

Co-Investigator(Kenkyū-buntansha) IWAI Takeo  The University of Tokyo, Research Center for Nuclear Science and Technology, Research Associate, 原子力総合研究センター, 助手 (30272529)
柴田 裕実  東京大学, 原子力研究統合センター, 助教授 (30216014)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥13,800,000 (Direct Cost: ¥13,800,000)
Fiscal Year 2004: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2003: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2002: ¥9,100,000 (Direct Cost: ¥9,100,000)
Keywordshigh-density excitation / ion beam / time-resolved luminescence spectrum / MgO / electron-hole plasma / CdS / layered perovskite-type compound / multiple quantum-well structure / 照射効果 / 拡散 / 励起子分子 / Urbach則 / 量子井戸構造 / 発光スペクトル / thermal spike
Research Abstract

We analyzed the high-density excitation effects and local high temperature state induced by energetic ions in various semiconductors by measuring the luminescence spectra under irradiation. Time-integrated luminescence spectra were measured with an OMA. Time-resolved spectra were measured with a time-correlated. single photon counting system, which determined the arrival time of ions by detecting with multichannel plates the secondary electrons emitted when the ions transmit a carbon foil.
At first, we have succeeded in observing the transient local high-temperature state along an ion trajectory by measuring the luminescence spectra of organic-inorganic layered perovskite materials, which is known to form a natural multiple quantum well structure and exhibit fast luminescence due to free excitons. Furthermore, from the relation between the observed local temperature and the excitation density, it was found that local melting occurs.
Secondly, we analyzed the spatial behavior of the excit … More ed carriers from the time-resolved luminescence spectra of CdS. By analyzing the spectral shape of a fast aluminescence band due to electron-hole plasma, we estimated the density and the average energy of the excited carriers when radiative recombination occurs. The obtained results can be quantitatively explained within the diffusion model where polar optical scattering of the excited carriers is taken into account.
In addition, we measured the luminescence spectra of a single crystal of MgO, in which the electron lattice coupling is slightly stronger than in semiconductors. As the excitation density increased, a luminescence band due to free excitons reduced its intensity, and finally disappeared. In contrast, another luminescence band appeared at the low-energy side of the free exciton band. Similarly to the case of conventional semiconductors, we attributed the disappearance of the free exciton band and the appearance of the new band to the screening of the Coulomb interaction and the radiative recombination in the collective excited states analogous to the electron hole plasma, respectively. Less

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (16 results)

All 2004 2003 2002 Other

All Journal Article (9 results) Publications (7 results)

  • [Journal Article] Quantum confinement for large light output from pure semiconducting scintillators2004

    • Author(s)
      K.Shibuya
    • Journal Title

      Applied Physics Letters 84

      Pages: 4070-4072

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Quantum confinement for large light output from pure semiconducting scintillators2004

    • Author(s)
      K.Shibuya
    • Journal Title

      Applied Physics Letter 84

      Pages: 4070-4072

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Development of ultrafast semiconducting scitillators using quantum confinement effect2004

    • Author(s)
      K.Shibuya
    • Journal Title

      Japanese Journal of Applied Physics Part 2(Express Letter) 43

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Measurement of the Local Temperature in an Ion Track Using Low-Dimensional Quantum Confinement Structure2003

    • Author(s)
      M.Koshimizu
    • Journal Title

      Radiation Physics and Chemistry 66

      Pages: 35-38

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Observation of Local Heating in an Ion Track by Measuring the Ion-Induced Luminescence Spectrum2003

    • Author(s)
      M.Koshimizu
    • Journal Title

      Nuclear Instruments and Methods B 206

      Pages: 57-60

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Time-resolved luminescence spectra of electron-hole plasma in ion-irradiated CdS2003

    • Author(s)
      M.Koshimizu
    • Journal Title

      Nuclear Instruments and Methods B 212

      Pages: 376-380

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Biexciton luminescence in the layered perovskite-type materials induced by high-energy ion irradiatoin2002

    • Author(s)
      M.Koshimizu
    • Journal Title

      Nonlinear Optics 29

      Pages: 397-402

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Scitillation Properties of (C_6H_<13>NH_3)_2PbI_4 : Exciton luminescence of an organic/inorganic multiple quantum well compound induced by 2.0 MeV protons2002

    • Author(s)
      K.Shibuya
    • Journal Title

      Nuclear Instruments and Methods B 194

      Pages: 207-212

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Biexciton luminescence in the layered perovskite-type materials induced by high-energy ion irradiation2002

    • Author(s)
      M.Koshimizu
    • Journal Title

      Nonlinear Optics 29

      Pages: 397-402

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] M.Koshimizu: "Measurement of the Local Temperature in an Ion Track Using Low-Dimensional Quantum Confinement Structure"Radiation Physics and Chemistry. 66. 35-38 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Koshimizu: "Observation of Local Heating in an Ion Track by Measuring the Ion-Induced Luminescence Spectrum"Nuclear Instruments and Methods in Physics Research B. 206. 57-60 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Koshimizu: "Time-resolved luminescence spectra of electron-hole plasma in ion-irradiated CdS"Nuclear Instruments and Methods in Physics Research B. 212. 376-380 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Koshimizu, K.Shibuya, K.Asai, H.Shibata: "Biexciton Luminescence in the Layered Perovskite-Type Materials Induced by High-Energy Ion Irradiation"Nonlinear Optics. 29. 397-402 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Shibuya, M.Koshimizu, Y.Takeoka, K.Asai: "Scitillation Properties of (C_6H_<13>NH_3)_2PbI_4 : Exciton luminescence of an organic/inorganic multiple quantum well compound induced by 2.0 MeV protons"Nuclear Instruments and Methods B. 194. 207-212 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Koshimizu, K.Shibuya, K.Asai, H.Shibata: "Measurement of the Local Temperature in an Ion Track Using Low-Dimensional Quantum Confinement Structure"Radiation Physics and Chemistry. 66. 35-38 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Koshimizu, K.Shibuya, K.Asai, H.Shibuya: "Observation of Local Heating in an Ion Track by Measuring the Ion-Induced Luminescence Spectrum"Nuclear Instruments and Methods B. (in press).

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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