P. Gonon et al., METAL INSULATOR/SEMICONDUCTOR TUNNEL-DIODES FORMED BY THE OXIDATION OF POLYCRYSTALLINE DIAMOND FILMS/, Journal of applied physics, 76(6), 1994, pp. 3929-3931
Polycrystalline diamond films have been annealed under O-2 at 600 degr
ees C, or have been dipped in a H2SO4/CrO3 solution. Both treatments r
esult in the formation of a thin electrically insulating layer at the
top of the films. Subsequent metallization results in the formation of
a metal/insulated diamond tunnel diode with a potential barrier for h
oles of 0.85 eV, and with a Fermi level localized at about 0.45 eV abo
ve the diamond valence band.