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Visible Luminescence Process in Silicon Materials

Research Project

Project/Area Number 09650068
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied physics, general
Research InstitutionNihon University

Principal Investigator

MURAYAMA Kazuro  Nihon University, College of Humanities & Sciences, Professor, 文理学部, 教授 (70107697)

Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1997: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsPorous Silicon / Amorphous Silicon / Quantum Confinement / Nanoparticle / Stokes shift / Luminescence / ストークスシフト / 励起スペクトル / 移動度端 / バンドテイル / 多層膜
Research Abstract

The evolution of a red luminescence spectrum of porous Si to the excitation energy has suggested that Si nanoparticles in the porous Si are discriminated into red-luminescent Si nanoparticles with bandgaps larger than 1.5 eV and red-nonluminescent ones with the smaller bandgaps. The evolution has shown that the luminescence peak energy EL of the porous Si nanoparticle is related to the bandgap Egby EL=0.65Eg+0.44 (eV). The relation has been explained from the model that holes in the Si nanoparticles excited by the interband excitation are trapped and then radiatively recombine with electrons in the conduction band.
The fundamental absorption edge spectra of ultrathin a-Si : H films with thicknesses of 400, 50, 25, 13 and 5 A in a-Si : H/a-Si_3N_4 : H multilayers have been determined over the absorption coefficient range from 10 to 10^6 cm^<-1> from the optical transmission and luminescence excitation spectra. The obtained spectra show that the extended states of the bulk a-Si : H exhibit an energy shift due to the quantumconfinement in the a-Si : H well layer while the localizedband tail states exhibit no significant energy shift. Excitation energy dependence of the peak energy of the luminescence has shown that the thermalization gapof the a-Si : H well layer increases with decreasing well layer thickness in thewell layers thinner than50 A and the luminescence in a-Si : H has the Stokes shiftof0.4 eV.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] K, Murayama: "Drspersive transport due to hopping on band edge fluctuating with self-affine fractal dimension" Physica Status Solide (b). 205巻. 129-134 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Murayama, H.Komatsu, S.Miyazaki and M.Hirose: ""Minimum in the bandgap and luminescence peak energy of red-Iuminescent Si nanoparticles in porous silicon"" Solid State Communications. 103. 155-160 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Murayama, T.Toyama, S.Miyazaki and M.Hirose: ""Fundamental absorption edge spectrum of ultrathin a-Si : H film in a-Si : H/a-Si_3N_4 : H multilayer obtained from luminescence excitation spectrum"" Solid State Communications. 104. 119-123 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Murayama, M.Yamamuro, H.Nakata, S.Miyazaki and M.Hirose: ""Excitation energy evolution of red-luminescence band in porous Si"" Journal of Porous Materials. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Murayama, N.Katagiri, S.Miyazaki and M.Hirose: ""Thermalization gaps of the ultra-thin a-Si : H well layers in a-Si : H/a-Si_3N_4 : H multilayers"" Solid State Communications. (Submitted).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Murayama: "Dispersive teansport due to hopping on bandedge fluctuating with selfaffine fractal dimension" Physica Status Solidi(b). 205巻. 129-134 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 村山和郎: "Minimum in the bandgap and luminescence peak energy of redluminescent Si nanoparticles in porous silicon" Solid State Communications. 103・3. 155-160 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 村山和郎: "Fundamental absorption edge spectrum of ultrathin a-Si:H film in a-Si:H/a-Si_3N_4:H multilayers obtained from puminescence excitation spectrum" Solid State Communications. 104・2. 119-123 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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