Nucleation and initial growth in the semimetallic homoepitaxial system of Bi on Bi(111),

In: Physical review. B, Jg. 79 (2009) ; Nr. 19, S. 193306
ISSN: 1095-3795, 1550-235X, 1098-0121
Zeitschriftenaufsatz / Fach: Physik
Fakultät für Physik » Experimentalphysik
Zentrale wissenschaftliche Einrichtungen » Center for Nanointegration Duisburg-Essen (CeNIDE)
The nucleation and initial growth of the semimetallic homoepitaxial system of Bi(111) was studied at 130 K by scanning tunneling microscopy. The island density increases with the cubic root of coverage, i.e., nx∝Θ1/3, up to 5.5×1011 islands/cm2 at 0.23 bilayer (BL) coverage. We determined a surface diffusion coefficient of D=2.6×106 s−1. Additionally, a transition of the island shape from compact to quasifractal was observed at about 0.1 BL coverage. The transition island size was estimated to be 70 nm2.