Model for radiation damage buildup in GaN

We propose a model that explains both saturation and a shift of the maximum of bulk disorder profiles in ion-implanted GaN. Our model is based on two main assumptions that (i) the advancing amorphous/crystalline interface acts as a perfect sink for mobile point defects generated in the crystal bulk and (ii) the diffusion length of mobile defects increases with increasing ion fluence due to saturation of defect sinks in the bulk. (C) 2011 Elsevier B.V. All rights reserved.