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Electronic Structure Analysis and Control of Conductive Properties of Amorphous Chalcogenides

Research Project

Project/Area Number 02453062
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 無機工業化学・無機材料工学
Research InstitutionTokyo Institute of Technology

Principal Investigator

KAWAZOE Hiroshi  Tokyo Institute of Technology Research Laboratory of Engineering Materials Professor, 工業材料研究所, 教授 (80087288)

Co-Investigator(Kenkyū-buntansha) YANO Tetuji  Tokyo Institute of Technology Faculty of Engineering Research Associate, 工学部, 助手 (90221647)
YASUMORI Atuo  Tokyo Institute of Technology Faculty of Engineering Research Associate, 工学部, 助手 (40182349)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥6,300,000 (Direct Cost: ¥6,300,000)
Fiscal Year 1991: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1990: ¥5,500,000 (Direct Cost: ¥5,500,000)
Keywordsa-In_2Se_3 / Edlectronic Structure / UPS / Photoconduction / アモルファスカルコゲナイド / 伝導性制御 / In_2Se_3 / hーBN / 非線形光学特性 / 透明伝導体 / フォトド-ピング
Research Abstract

Electronic Structure of a-In_2Se_3 was examined by ultraviolet photoelectron spectroscopy with syncrotron orbil radiation as an excitation light. It was found that a-In_<>Se_3 has almost identical valence band structure with crystalline In_2Se_3. The valence band is composed of Se 4p nonbonding band, Se 4p-In 5p p-p sigma bonding band, Se 4p-In 5s p-s sigma bonding band and Se 4s core band from the top. In the excitation spectrum of photoconduction in a-In_2Se_3 a small peak was observed at about 0.7eV in addition to the large peak at a wavelength equivalent to the band gap. These observations support the model proposed on the basis of tight binding energy band that tetrahedrally coordinated In and Se produce the above mentioned valence band structure and octahedrally coordinated In atoms, which are a minor component, constitute a pseudoconduction band in the band gap of the tetrahedrally coordinated in atoms. The pseudoconduction band was found to act as a conduction band in a-In_2Se_3. This results in the anomalous low activation energy for electrical conduction observed for the amorphous chalcogenides.
A large mobility of an electron in the conduction band mostly constructed by ns atomic orbitals of p-block cations is well established in the above mentioned experiments. The third order nonlinear susceptibility of a-SnO_2 and a-In_2O_3 was estimated by the third harmonic generation method under a working hypothesis that the high mobility is effective for the high susceptibility. The susceptibility values of 5X10^<-12> esu and 1X10^<-12> esu were found for a-SnO_2 and a-In_2O_2, respectively. The working hypothesis was found to be effective in searching a new material with the high susceptibility.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] S.Kaneko: "Electronic Structure and Electrical Conduction Processes of a-In_2Se_3" Physical Review B.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] N.Ueda: "Third-Order Nonlinear Optical Susceptibilities of Electroconductive Oxide Thin Films" Applied Physics Letters. 59. 502-503 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] N.Ueda: "Electronic Structure and Optoelectronic Properties of Inorganic Solids" Peport of The Research Laboratory of Engineering Materials,Tokyo Institute of Technology.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] N.Ueda: "New Oxide Phase With High Optical Transparency and Electroconductivity" Nature.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] N.Ueda: "Transparent and Electroconductive Oxide MgIn_2O_4 Structure,Electronic Structure,Optical Properties and Electroconductivity" Physical Review B.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] T.Omata: "Cadmium Gallium Spinel as a New Transparnt and Electroconductive Oxide" Japanese Journal of Applied Physics.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S. Kaneko: "Electronic Structure and Electrical Conduction Processes of a-In_2Se_3" Physical Revies B.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] N. Ueda: "Third-Order Nonlinear Optical Susceptibilities of Electroconductive Oxide Thin Films" Applied Physics Letters. 59. 502-503

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S.Kaneko: "Electronic Structure and Electrical Conduction Processes of aーIn_2Se_3" Physical Review B.

    • Related Report
      1991 Annual Research Report
  • [Publications] N.Ueda: "ThirdーOrder Nonlinear Optical Susceptibilities of Electroconductive Oxide Thin Films" Applied Physics Lettes. 59. 502-503 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] N.Ueda: "Electronic Structure and Optoelectronic Properties of Inorganic Solids" Peport of the Research Laboratory of Engineering Materials.Tokyo Institute of Technology.

    • Related Report
      1991 Annual Research Report
  • [Publications] N.Ueda: "New Oxide Phase with Higy Optical Transparency and electroconductivity" Nature.

    • Related Report
      1991 Annual Research Report
  • [Publications] N.Ueda: "Transparent and Electroconductive Oxide MgIn_2O_4 Structure.Electronic Structure,Optical Properties and Electroconductivity" Physical Review B.

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Omata: "Cadmium Gallium Spinel as a New Transparent and Electroconductive Oxide" Japanese Journal of Applied Physics.

    • Related Report
      1991 Annual Research Report
  • [Publications] H.Kawazoe: "Electronic Structure of amorphous and crystalline In_2Se_3 by photoemission measurements" Physical Review B.

    • Related Report
      1990 Annual Research Report
  • [Publications] H.Mizoguchi: "Photoーdoping of Ag in aーIn_2Se_3" Physical Review B.

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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