Diamond Surfaces with Air-Stable Negative Electron Affinity and Giant Electron Yield Enhancement
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The presence of an air-stable negative electron affinity (NEA) on lithium-covered oxygen-terminated diamond after a thermal activation process is demonstrated. The NEA is unequivocally established by the onset of photoelectron yield at the bandgap energy of 5.5 eV. This surface exhibits a secondary electron yield enhancement by a factor of 200, compared to a surface with positive electron affinity. The surface chemistry leading to the necessary surface dipole was elucidated by core-level photoemission spectroscopy in conjunction with previous theoretical calculations. The insensitivity to the details of the deposition process opens a route to practical and robust negative-electron affinity devices based on diamond.
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O'Donnell, Kane; Edmonds, M.; Tadich, A.; Thomsen, L.; Stacey, A.; Schenk, A.; Pakes, C.; Ley, L. (2015)We report large negative electron affinity (NEA) on diamond (100) using magnesium adsorption on a previously oxygen-terminated surface. The measured NEA is up to (-2.01±0.05) eV, the largest reported negative electron ...
O'Donnell, Kane; Martin, T.; Edmonds, M.; Tadich, A.; Thomsen, L.; Ristein, J.; Pakes, C.; Fox, N.; Ley, L. (2014)This paper reviews electron emission from negative electronaffinity (NEA) diamond and gives account of the recentdevelopments in alternatives to hydrogen-termination forproducing NEA diamond surfaces, particularly using ...
O'Donnell, Kane; Martin, T.; Allan, N. (2015)Recently a lithiated C(100)-(1 × 1):O surface has been demonstrated to possess a true negative electron affinity: that is, the conduction band minimum at the surface is lower in energy than the local vacuum level. Here ...