Detection of interstitial Ga in GaN
We report the direct detection of interstitial Ga by optical detection of electron paramagnetic resonance (ODEPR) in the photoluminescence of n-type GaN after irradiation in situ at 4.2 K with 2.5 MeV electrons. It is stable upon annealing until room temperature, where it becomes mobile and trapped to form a new defect which is observed to emerge as the interstitial disappears. The time constant of the process at room temperature is approximately 200 min. The emergence of another ODEPR center beginning at approximately 135 K suggests even easier migration of one of the other intrinsic defects in the GaN lattice.
Chow
KH
Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, Pennsylvania 18015, USA.
Watkins
GD
Usui
A
Mizuta
M