The surface potential difference between an H-terminated surface and a locally oxidized
diamond surface produced by an atomic force microprobe was investigated using a Kelvin
probe force microscope. The potential of the H-terminated diamond surface was observed to
be∼ 0.1 V higher than that of the oxidized diamond surface. The surface potential difference
can be interpreted in terms of the positions of the vacuum level, the Fermi level, and the
conduction and valence band edges, when negative electron affinity and p-type surface …