Role of island corner rounding in the morphology transition of the submonolayers grown on metal (1 1 0) surfaces

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

View graph of relations

Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)197-203
Journal / PublicationApplied Surface Science
Volume233
Issue number1-4
Publication statusPublished - 30 Jun 2004

Abstract

The role of island corner rounding in the temperature-dependent transition of one-dimensional (1D) monoatomic chain to two-dimensional (2D) island of the epitaixal submonolayers grown on metal (110) surfaces is studied. We show by Kinetic Monte Carlo simulations and a rate-equation analysis that for aggregation without detachment the anisotropy in corner rounding does play a decisive role in this morphology evolution, agreeing with a previous study where the one-way corner rounding controls the formation of 1D chain at intermediate temperatures and the two-way corner rounding is responsible for its transition to 2D island at high temperatures. However, for fully reversible aggregation, our simulation results reveal that the one-way corner rounding plays a minor role in the formation of 1D chain, even its activation energy can be significantly reduced. Instead, the capture of in-channel-diffusing adatoms by other adatoms or islands leading to the formation of in-channel bonds is responsible for the formation of 1D chain. With its hopping barrier normally less than that of the two-way corner rounding in metal (110) systems, the in-channel detachment by breaking one in-channel bond governs the transition of 1D chain to 2D island. Our simulation also shows that without the cross-channel atomic interaction the 2D island cannot be formed for fully reversible aggregation. © 2004 Elsevier B.V. All rights reserved.

Research Area(s)

  • Growth mechanism, Monte Carlo simulation, Submonolayers, Thin film