Extremely high negative electron affinity of diamond via magnesium adsorption
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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 affinity to date. Despite the expected close relationship between the surface chemistry of Mg and Li species on oxygen-terminated diamond, we observe differences in the adsorption properties between the two. Most importantly, a high-temperature annealing step is not required to activate the Mg-adsorbed surface to a state of negative electron affinity. Diamond surfaces prepared by this procedure continue to possess negative electron affinity after exposure to high temperatures, air, and even immersion in water.
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O’Donnell, Kane; Edmonds, M.; Ristein, J.; Tadich, A.; Thomsen, L.; Wu, Q.; Pakes, C.; Ley, L. (2013)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 ...
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 ...