Hydrogen is introduced in polycrystalline diamond during the deposition process (intrinsic
hydrogen) or by post-hydrogenation and bulk diffusion. It is possible to control in a selective
manner (by chemical or thermal treatments) the removal of superficial or subsurface
hydrogen. The photoelectron spectroscopy (XPS and UPS) results at the moderately doped
polycrystalline diamond surface are reported, depending on hydrogenation or
dehydrogenation treatments. The Fermi level pinning position shift and the oxygen bonding …