Abstract
A 135° electrostatic spherical deflection analyzer was used to investigate the total energy distribution (TED) of field emitted electrons from the (0001) and (0001̄) planes of field evaporated zinc oxide tips. The spectra show structures in the form of peaks which are interpreted as emission from surfaces states lying in the band gap; the shape and the position of these peaks depend on the crystallographic orientation of the emitting area. The full-width-at-half-maximum of the TED cruves increases with the applied electric field but there is no displacement of the energy distributions with respect to the Fermi level. Measurements of energy distribution were also made from (0001̄) oriented tips previously field evaporated in hydrogen; an intense peak located as low as ~4 eV below the Fermi level is observed and this result is discussed in terms of resonance tunneling.
Published Version
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