ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
This letter reports, diamond field emitters, Cs treated, air stable, that emit electrons at the lowest reported field, 〈0.2 V μm−1. Field emission from B-, Li-, P-, and N-doped diamonds and carbonized polymer was characterized as a function of surface treatment. A treated with an O2 plasma, coated with Cs, heated, and exposed to O2 exhibited increased emission for all samples except for B-doped diamond. The best emission was obtained from N-doped diamond samples, followed by carbonized polymer, the Li-doped, and polycrystalline P-doped diamond. Li- and N-doped samples treated with Cs were stable in laboratory air for several days. This stability of the surface-activated diamond is believed to be due to the formation of a diamond–O–Cs salt. If the sample is treated with a H2 plasma instead of an O2 plasma, the Cs-enhanced emission degrades with heat and exposure to O2. Subbands formed by Li and N impurities are believed to be responsible for this enhanced emission. The surface treatment on N-doped diamond results in emission at fields as low as 0.2 V μm−1. © 1995 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.114529
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