Horn-von Hoegen, Michael; Müller, B.H.; Al Falou, A.; Henzler, M.:
Surfactant induced reversible changes of surface morphology
1993
In: Physical Review Letters, Jg. 71 (1993), Heft 19, S. 3170 - 3173
Artikel/Aufsatz in Zeitschrift / Fach: Physik
Fakultät für Physik » Experimentalphysik
Titel:
Surfactant induced reversible changes of surface morphology
Autor(in):
Horn-von Hoegen, Michael im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen; Müller, B.H.; Al Falou, A.; Henzler, M.
Erscheinungsjahr:
1993
Erschienen in:
Physical Review Letters, Jg. 71 (1993), Heft 19, S. 3170 - 3173
ISSN:
ISSN:
Link URL:

Abstract:

We have investigated the influence of a surfactant on the equilibrium surface morphology in the pseudomorphic regime of heteroepitaxial growth. At 700 °C, 8 monolayers of Ge on Si(001) using Sb as surfactant form strained islands with a size of ∼300 Å, allowing partial elastic relaxation. The surface morphology depends strongly on the Sb coverage and changes from islands with [117] facets at high Sb coverage via round, flat cones with an inclination angle of 12° to islands rotated by 45° with [105] facets formed during growth at low Sb coverage. The equilibrium conditions are verified by the reversible transition from [117] facets to 12° cones initiated by a change of the surfactant coverage.