Extended annealing duration and increased deposition amount effects and AFM side views. (a) Extended annealing duration effect on self-assembled Au droplets. (b) Increased deposition amount effect. Au droplets in (a) are fabricated with 2 nm of Au deposition at 700°C with × 5 longer annealing duration of 150 s. In (b), the Au droplets are fabricated with 30 s at 700°C with an increased deposition amount of 4 nm. (a) and (b) are AFM top views of 1 (x) × 0.5 (y) μm2 and (a-2) and (b-2) show AFM side views of 1 × 1 μm2.