The results of the first electron paramagnetic resonance study of deep B centers in this material were reported. A direct identification of the B atom which was involved in the defect center, which was concluded to be deep B, was established by the presence of a hyperfine interaction with 11B and 10B nuclei in isotope-enriched B-doped 6H-type crystals. Deep B centers were shown, by electron paramagnetic resonance spectra, to have an axial symmetry along the hexagonal axis. A correspondence was found between the electron paramagnetic resonance spectra and the luminescence, optically-detected magnetic resonance and deep-level transient spectra of deep B centers. It was suggested that the structure of the deep B center was that of a B-vacancy pair.

P.G.Baranov, E.N.Mokhov: Semiconductor Science and Technology, 1996, 11[4], 489-94