The effect of step-wise surface nitrogen doping in MPECVD grown polycrystalline diamonds

摘要: Abstract Optical centres embedded via nitrogen doping in polycrystalline diamonds (PCDs) are becoming increasingly useful for several wide-area applications including magnetic field sensing. Therefore, investigating the effect of step-wise surface PCDs deposited at low pressure is essential. In this study, influence a process on has been investigated to explain dominance neutral charged NV (NV0) chemical vapour deposition (CVD) chamber. The properties films were probed using Raman spectroscopy, Photoluminescence spectroscopy (PL), Scanning Electron Microscopy (SEM), Atomic Force (AFM), X-ray Photoelectron Spectroscopy (XPS) and Grazing Incidence Diffractogram (GIXRD). results obtained from analysis corroborated by SEM micrographs show formation nanocrystalline (NCDs) with large quantity sp 2 /a-C (amorphous carbon) phases flow rates doped PCDs. Conversely, increasing rate ([N/C] > 0.0025) reduced nano-grains resulting decrease contents grains grain boundaries. increase [N/C] ratio content high (10 sccm) enhanced negatively nitrogen-vacancy (NV−) centres. Furthermore, it was shown that occurrence stable NV− also function boundary line density: density increases concentration thereby quenching PL intensity Samples have roughness less than 10 nm. highly will optimize performance magnetometers uses these diamond as detectors. Our give better understanding pressure.