Meyer zu Heringdorf, Frank; Roos, Kimberly L.; Wiethoff, Christian; Horn-von Hoegen, Michael; Roos, Kelly R.:

Growth of Ag nanowires on Au-pre-facetted 4? vicinal Si(0 0 1)

In: Surface Science, Jg. 602 (2008) ; Nr. 10, S. 1852-1857
ISSN: 0039-6028
Zeitschriftenaufsatz / Fach: Physik
Fakultät für Physik » Experimentalphysik
Abstract:
We studied the self-assembly of wire-shaped Ag islands at high temperature with low energy electron microscopy and photoemission electron microscopy. A Au-faceted vicinal Si(0 0 1) surface was used as a substrate. The initial Ag deposit at 600–620 °C induces a surface phase change from the (5 × 3.2) reconstruction of the Au-covered (0 0 1) terraces, to a (3 × 2) reconstruction, but leaves the structure of the Au-induced step bunches intact. Subsequent Ag growth produces two distinct types of 3D crystalline islands: compact and wire-like. The total Ag deposit is comprised mostly of compact islands, with only a small minority of wire-like islands. We attribute the wire formation to local step bunches that create the proper quasi-one-dimensional diffusion environment for the Ag islands to grow with a high aspect ratio.