Figure 1From: The fabrication of white light-emitting diodes using the n-ZnO/NiO/p-GaN heterojunction with enhanced luminescenceSEM images and XRD pattern of ZnO. (a,b) SEM images of as-grown ZnO nanorods and nanotubes on GaN. (c) XRD pattern of ZnO grown on GaN substrate.Back to article page