The results of noise spectroscopy performed on p-type Mg-doped samples were considered. In addition to the 1/f noise, significant generation–recombination noise was observed and was shown to be linked to metastable DX-like centers. These centers were correlated with metastable defects having optical ionization energies of 1.1 and 1.9eV, respectively. The energy barriers for capture into, and emission from, the fundamental state were quantitatively determined. A model was proposed for the configuration coordinate diagram that explained the PPC in GaN:Mg in the light of the results obtained from noise spectroscopy.

Noise Spectroscopy of Metastable Deep Level Centers in Mg-Doped GaN. D.Seghier, H.P.Gislason: Physica B, 2003, 340-342, 381-4