Work function and electron affinity of the fluorine-terminated (100) diamond surface
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The work function and electron affinity of fluorine-terminated (100) diamond surfaces prepared by exposure to dissociated XeF2 have been determined using synchrotron-based photoemission. After vacuum annealing to 350°C a clean, monofluoride terminated C(100):F surface was obtained for which an electron affinity of 2.56 eV was measured. This is the highest electron affinity reported for any diamond surface termination so far, and it exceeds the value predicted by recent density functional theory calculations by 0.43 eV. The work function of 7.24 eV measured for the same surface places the Fermi energy of 0.79 eV above the valence band maximum.
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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 ...
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 ...
Use of energy-filtered photoelectron emission microscopy and Kelvin probe force microscopy to visualise work function changes on diamond thin films terminated with oxygen and lithium mono-layers for thermionic energy conversionAndrade, H.; Othman, M.; O'Donnell, Kane; Lay, J.; May, P.; Fox, N.; Morin, J.; Renault, O. (2014)Kelvin probe force microscopy (KPFM) and energy-filtered photoelectron emission microscopy (EF-PEEM) with vacuum UV (VUV) excitation have been used to study the work function of p-type diamond films treated to exhibit a ...