Figure 4
From: Nickel-containing nano-sized islands grown on Ge(111)-c(2 × 8) and Ag/Ge(111)-(√3 × √3) surfaces
Empty-state STM images showing Ni-containing structures on Ag/Ge (111)-√3 × √3 surface. (a) Triple-hole defects which appear after annealing between 470 and 570 K. (b) Long islands (enclosed by circles) which appear after annealing above 670 K. (c) Zoomed long island with a corresponding schematic diagram of Ag/Ge(111)-√3 × √3 surfaces in which three directions for island growth are indicated.