Data for Identification and characterisation of point defects in CVD diamond (PhD Thesis)

A pseudo-local vibrational mode (pLVM) of the SiV0 centre is identified at 976 nm. IR absorption and PL measurements of nitrogen-doped CVD diamond will often observe a hydrogen-related line at 7354 cm-1 /1360 nm, and a suite of diamonds containing this feature are studied. The 7354 cm-1 centre is observed to exhibit preferential orientation relative to the growth direction when grown on { 0 0 1 }­and {1 1 0}-oriented substrates, which is subsequently lost upon annealing at a temperature of at least 1000 °C. Upon thermal treatment the 7354 cm-1 line will charge transfer and increase in intensity, given a sufficient concentration of accep­tors are also present.

The excited state of the 7354 cm-1 transition is determined to be degenerate through thermalisation experiments, whilst under applied stress, with a purpose-built PL spectrometer equipped with 1064 nm excitation. Previous results allow for the 7354 cm-1 line to be assigned to ( at least) an E - E transi­tion, but the exact symmetry of the defect responsible for the transition cannot be confidently determined. An annealing study of two brown-coloured boron-doped CVD diamonds is also reported.

Upon annealing between 1000-1500 °C, the brown-colouration is pro­gressively annealed-out along with a number of unidentified features in the UV­Vis absorption spectra; simultaneously, IR absorption measurements observe a progressive increase in the uncompensated boron concentration. A large number of unreported features are also observed with IR absorption measurements, which show negligible change in intensity from annealing and charge transfer treatment.

However, most are 100% preferentially orientated either parallel or perpendicular to the growth direction of the diamond. It is also the case with PL measurements that many unidentified ZPLs are observed. The nature of the majority of spectro­scopic features observed in these boron-doped diamonds is currently unknown.<br><br>Data record consists of a zip archive, organised into subfolders according to thesis chapter and figure number, containing raw data and an accompanying readme file.

Further information on specific data files can be found in the accompanying readme file.