Discharging, enhancement, and control of electron emission of hydrogen free diamond film surfaces by subband gap light illumination

Journal Article · Mon Apr 24 00:00:00 EDT 2006 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2199487· OSTI ID:20779180

Hoffman, A; Lafosse, A; Azria, R ^[1]

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1. Chemistry Department, Technion, Haifa 32000 (Israel)

We report on the surface charge elimination, enhancement, and control of secondary electron emission from hydrogen free polycrystalline diamond film surfaces subjected to continuous low energy electron irradiation. Hydrogen free diamond surfaces severely charge under electron irradiation by nonresonance charge trapping in surface {pi} bonds associated with surface reconstruction. Concurrent electron irradiation and illumination of the diamond surface with subband gap photons enhance the secondary electron emission yield and discharge the surface accumulated charge. These effects are suggested to be associated to direct photoexcitation of trapped charge in midgap surface states which result in neutralization and unpinning of the surface bands.

• OSTI ID: 20779180
• Journal Information: Applied Physics Letters, Vol. 88, Issue 17; Other Information: DOI: 10.1063/1.2199487; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DIAMONDS
ELECTRON BEAMS
ELECTRON EMISSION
ELECTRONS
ILLUMINANCE
IRRADIATION
PHOTONS
POLYCRYSTALS
SURFACE TREATMENTS
THIN FILMS
TRAPPING
VISIBLE RADIATION