Figure 1.

a The top and side views of dimmer-adatom-stacking (DAS) fault Si(111)-7 × 7 structure. The blue balls are the Si adatoms, and the pink balls are the Si rest atoms. The positions of H3, B2 and S sites are indicated in the top view within a “basin”, b the top view of 19H-Si(111)-7 × 7 model surface. The small yellow balls on the Si atoms with dangling bond are H atoms

Lin et al. Nanoscale Research Letters 2009 5:143-148   doi:10.1007/s11671-009-9456-x