Jb. Cui et al., ELECTRON-AFFINITY OF THE BARE AND HYDROGEN COVERED SINGLE-CRYSTAL DIAMOND(111) SURFACE, Physical review letters, 81(2), 1998, pp. 429-432
The electron affinity chi and the band diagram of single crystal diamo
nd (111) surfaces was determined as a function of hydrogen coverage by
combining work function measurements with photoelectron yield and cor
e level photoemission spectroscopy. chi ranges from -1.27 eV for the f
ully hydrogen covered (1 X 1) surface to +0.38 eV for the hydrogen fre
e (2 X 1) reconstructed surface. This change is quantitatively explain
ed by a surface dipole model provided a coverage dependent depolarizat
ion is included. The dipole moment of the C-H bond on diamond (111) is
found to be 0.09 e Angstrom.