Figure 2
From: Critical aspects of substrate nanopatterning for the ordered growth of GaN nanocolumns
Effect of surface cleaning on the columnar growth. Left side: (a) SEM and (c) AFM images of a nanopatterned Ti mask with resist residues (whiter spots). Right side: (b) top view and (d) side view SEM images of GaN NCs grown by PA-MBE using these masks, showing ordered columns grown inside the holes and thinner and longer columns grown in the area between the holes on the Ti mask.