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The Investigation of Quantum Effects of Band-Edge Modulated Nano-Structure Noncrystalline

Research Project

Project/Area Number 10650023
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied materials science/Crystal engineering
Research InstitutionHiroshima Institute of Technology

Principal Investigator

MORIGAKI Kazuo  Hiroshima Institute of Technology, Department of Electrical Engineering, Professor, 工学部, 教授 (60013471)

Co-Investigator(Kenkyū-buntansha) OGIHARA Chisato  Yamaguchi University, Department of Applied Science, Associate Professor, 工学部, 助教授 (90233444)
MORIGAKI Kazuo  Hiroshima Institute of Technology, Department of Electrical Engineering, Professor (60013471)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1999: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1998: ¥2,800,000 (Direct Cost: ¥2,800,000)
KeywordsNoncrystalline / Amorphous / Semiconductors / Nanostructure / Quantum effect / Band-edge modulation
Research Abstract

The band-edge modulated a-Si, N : H films are used in this study as band-edge modulated nano--structure-noncrystalline semiconductors, which are fabricated by spatially modulating nitrogen content along a direction perpendicular to the deposited film. In this film, the bottom of conduction band and the top of valence band are spatially modulated along this direction, because the band gap is varied by nitrogen content. The optical gap energy has been confirmed to be varied by the modulation period of the film. This can be accounted for in terms of one-dimensional harmonic oscillator potential model giving the separation of the lowest quantized levels of both bands as a function of the modulation period.
In this study, we have attempted observations of optical transitions between the quantized levels, using the techniques of optical absorption and photoconductivity. We have developed the optical system making enable to observe these transitions. The experiments are going on down to 11K fo … More r this purpose.
The defects states and their quantum effects of the band-edge modulated a-Si, N : H films have been investigated using the electron spin resonance (ESR) technique. The observed g-values of silicon dangling bonds range between 2.0031-2.0039 in the films of modulation periods of 21-100Å. No dependence of the g-value on the modulation period has been observed. From the g-values, the magnetic centres responsible for ESR are identified by silicon dangling bonds having three back-bonds with nitrogen and having two back-bonds with nitrogen and one back-bond with silicon. These dangling bonds exist in the nitrogen-rich region. They are deep centres so that the g-value is not affected by quantum effect. The spin density is increased with decreasing the modulation period because the nitrogen-rich region becomes more disordered.
The luminescence of the band-edge modulated films arises from radiative recombination of singlet excitons, triplet excitons and electron-hole pairs. The excitons are found to be more stabilized by the confinement effect of modulated potentials. Less

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] C. Ogihara, K. Morigaki 他: "Lifetime Distribution of Plunder pulsed excitation in hydrogenated amorphous silicon based films"Journal of Noncrystalline Solids. (印刷中). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Morigaki: "Physics of Amorphous Semiconductors"World Scientific, Singapore and Imperial College Press, London. 418 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] C. Ogihara et al.: "Lifetime distribution of PL under pulsed excitation in hydrogenated amorphous silicon based films"Journal of Noncristalline Solids. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Morigaki: "Physics of Amorphous Semiconductors"World Scientific, Singapore and Imperial College Press, London. 418 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] C.Ogihara,K.Morigaki他: "Lifetime Distribution of PLunder pulsed excitation in hydrogenated amorphous silicon based films"Journal of Noncrystalline Solids. (印刷中). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.Morigaki: "Physics of Amorphous Semiconductors"World Scientific,Singapore and Imperial College Press,London. 418 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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