Realization of long time stable negative electron affinity surface and production of efficient emitter

• Project/Area Number: 15560019
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: 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): 2003 – 2004
• Project Status: Completed(Fiscal Year 2004)
• Budget Amount: ¥3,500,000 (Direct Cost : ¥3,500,000); Fiscal Year 2004 : ¥900,000 (Direct Cost : ¥900,000); Fiscal Year 2003 : ¥2,600,000 (Direct Cost : ¥2,600,000)
• Keywords: diamond / electron emission / negative electron affinity / field emission / barium / cesium / MDS / NEA / 電界電子放出 / TDS

Research Abstract

We have studied the stability of cesium oxide on CVD diamond, stability of photoelectron emission from cesium oxide covered CVD diamond and the field emission characteristics of nano-scale diamond.
1)The about 3 ML cesium layers on CVD diamond turn to cesium super oxide by exposure of several Langumier of oxygen
This super oxide is stable when it is exposed to atmosphere. This super-oxide covered CVD diamond is one of the good candidate for ultra violet light photo cathode.
2)We have succeeded in the production of nano size diamond crystal. The reduction in gas pressure during growth and application of voltage between hot filaments and substrates are affective to produce high-quality nano diamond crystal.
3)We measured electron emission characteristics for these CVD diamond thin films. The threshold field strength for electron emission and emission current density are 3.2 V/μm and 4 mA/cn^2 which are much better than normal micro meter crystal size diamond films.

Research Products

• [Book] 新訂版・表面科学の基礎と応用 (2004)
  • Author(s): 本郷 昭三他多数
  • Total Pages: 1531
  • Publisher: (株)エヌ・ティー・エス
  • Description: 「研究成果報告書概要(和文)」より
• [Book] 新訂版・表面科学の基礎と応用 (2004)
  • Author(s): 本郷昭三 他多数
  • Total Pages: 1531
  • Publisher: (株)エヌ・ティー・エス