Evolution of self-assembled Au droplets by increased Ta with 2.5-nm Au deposition on GaAs (111)A. (a-d) AFM top-view images of 3 × 3 μm2 are shown with corresponding Ta, and the enlarged images of 1 × 1 μm2 are shown in (a-1) to (d-1). (a-2) to (d-2) are cross-sectional surface line profiles acquired from the white lines in (a-1) to (d-1), and (a-3) to (d-3) show the 2-D FFT power spectra. Height distribution histograms are shown in (a-4) to (d-4).
Li et al. Nanoscale Research Letters 2014 9:113 doi:10.1186/1556-276X-9-113