Abstract
The field emission properties of a polycrystalline diamond film with hydrogenated and hydrogen free surfaces have been investigated by monitoring both the emission current–voltage curve and emission site density. A very low turn-on field of electron emission was found to be 0.5 V/μm for the hydrogenated surface and 4 V/μm for the hydrogen free surface. The emission site densities were significantly reduced from 3×103 to 2×102 cm−2 at 5 V/μm after the surface hydrogen desorption. The low turn-on field and high emission site density on the hydrogenated surface are explained by the low work function of diamond combined with graphitic patches on the surface.
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