A detailed study was made of as-grown Zn-doped samples by using optically detected magnetic resonance spectroscopy. As well as the well-known spectra of an effective mass-like donor and Zn acceptor, a positive optically detected magnetic resonance spectroscopy signal from an S = ½ paramagnetic center was observed while monitoring the predominant blue luminescence band which peaked at 2.8eV. The involvement of a single Ga nucleus in the defect center was deduced from well-resolved hyperfine interactions that involved 71Ga (39.9%) and 69Ga (60.1%); both with a nuclear spin of I = 3/2. The C3v symmetry, hyperfine interaction and formation behaviour suggested that the centre was Ga-related.

Ga-Related Defect in As-Grown Zn-Doped GaN: an Optically Detected Magnetic Resonance Study. P.N.Hai, W.M.Chen, I.A.Buyanova, B.Monemar, H.Amano, I.Akasaki: Physical Review B, 2000, 62[16], R10607-9