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Electron emission mechanism from negative electron affinity surface and production of highly efficient electron emitter

Research Project

Project/Area Number 13650027
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 表面界面物性
Research InstitutionFaculty of Engineering, Kobe University

Principal Investigator

HONGO Shozo  Kobe University Faculty of Engineering associate professor, 工学部, 助教授 (00029232)

Co-Investigator(Kenkyū-buntansha) URANO Toshio  Kobe University Faculty of Engineering associate professor, 工学部, 助教授 (40107983)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2001: ¥2,600,000 (Direct Cost: ¥2,600,000)
Keywordsdiamond / cesium / barium / electron emission / negative electron affinity / NEA / MDS / TDS / MDS / diamond / H-terminated diamond / Cs / negative electron affinity / electron emitter / field emission
Research Abstract

1) Oxidation process of Cs adsorbed on CVD diamond surfaces was investigated. The oxidation process is the same as that of Si and GaAs. Namely, with the adsorption of oxygen, oxide, peroxide and superoxide were formed. Superoxide is chemically stable upon oxygen exposure.
2) Silicon and gallium arsenide with cesium on their surface is oxidized very easily. On the contrary diamond with cesium on the surface is not oxidized.
3) As the result, the potential layer to disturb electron emission from the surface is not formed. This enables the stable electron emission after oxygen exposure. This fact is very important to realize practical electron emitters.
4) Barium adsorbed diamond surface was also studied. The oxidation process is similar to the case of cesium adsorption. Barium adsorbed diamond surface is also potential for electron emitters.
5) It was found from desorption spectrum study that barium layer deposited on diamond is thermostable up to 400℃.
6) Electron emission from Cs deposited diamond surface was measured. Threshold field for electron emission was 0.8 V/μm. Emission current density of 2 μA/mm^2 was obtained for the field strength of 15 V/μm. It was fairly stable to time and exposure to air. Luminescence from ITO used for an anode was confirmed.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] Shigeru Yoshida: "Cs adsorption on H-terminated CVD-diamond studied by thermal desorption spectroscopy"Surface science. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shigeru Yoshida, Masaya Toyosima, Toshio Urano, and Shozo Hongo: "Cs adsorption of H-terminated CVD-diamond studied by thermal desorption spectroscopy"Surface science. in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shigeru Yoshida: "Cs adsorption on H-terminated CVD-diamond studied by thermal desorption spectroscopy"Surface science. (印刷中).

    • Related Report
      2002 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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