Molecular oxygen adsorption and desorption from single crystal diamond (1 1 1) and (1 1 0) surfaces

The role of (sub)-surface oxygen on the surface electronic structure of hydrogen terminated (100) CVD diamond

“…3. Though the exact model of surface conductivity after a hydrogenation in a H2/O2 mixture is still under discussion, we believe that the presence of oxygen, as confirmed by XPS, and the upward band bending, confirmed by UPS, point towards a possible strong coupling of O-surface states, reported previously in the literature [8], into the valence band maximum (VBM) could lead to the electron tunneling from such states to the VBM, and the tunneled charge can be efficiently led out of the sample, leading to sufficient conductivities and consequently possible STM imaging. The symbols as the electron affinity work function χ , determined by UPS are discussed in the text.…”

“…Maier et al [7] gave the first experimental evidence that chemisorbed hydrogen is a necessary but not a sufficient prerequisite for such surface conductivity and that the electron acceptors are provided by atmospheric adsorbates, leading to the so called "transfer surface doping" model. Oxygen can play an important role in this process but its influence is not fully understood [8]. The aim of this paper is to elucidate further the mechanism responsible for the surface conductivity and the role of oxygen herein.…”

Oxidation electronics: bond–band–barrier correlation and its applications

“…An investigation by Zhu et al [510] revealed that diamond oxidation occurs at $ 1070 K and suggested that diamond oxidation depends on the crystal orientation and defect density. Thermal-programmed desorption (TPD), EELS and AES investigating the oxidation of single crystal diamond (111) and (110) surfaces [511] revealed that molecular oxygen is easily chemisorbed on the clean diamond surfaces at room temperature. Carbon monoxide was the only product of thermal desorption from both surfaces.…”

Design Materials and Processes

“…Molecular oxygen adsorption happens to the clean (111) and (110) surfaces of diamond at room temperature [88]. Thermal desorption produces CO from both surfaces.…”