Shape, orientation, and crystalline composition of silver islands on Si(111)

In: IBM Journal of Research and Development, Jg. 55 (2011) ; Nr. 4, S. 9:1 -9:6
ISSN: 0018-8646
Zeitschriftenaufsatz / Fach: Physik
Fakultät für Physik » Experimentalphysik
Photoemission electron microscopy and spot profile analyzing low-energy electron diffraction have been used to study the temperature-dependent growth of Ag islands on a Si(111) surface. Depending on growth temperature, various island shapes can be formed. At low temperatures, polygonic islands are formed, consisting of both Ag(001) and Ag(111) crystal orientations. At higher temperatures, islands consist mostly of Ag(111) orientation and are predominantly of triangular shape. As the islands grow, it is possible that the crystalline composition of an island changes. We observed that Ag(001)-oriented areas convert into areas of Ag(111) orientation. The rotational orientation of the Ag islands with respect to the substrate is explained by a modified coincidence-site lattice approach.