Theoretical investigations of adatom behavior on non-planar surfaces with GaAs(n 1 1)A

Koichi Asano, Yoshihiro Kangawa, Hirotoshi Ishizaki, Toru Akiyama, Kohji Nakamura, Tomonori Ito

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The behavior of Ga and As adatoms on non-planar surfaces consisting of GaAs(0 0 l)-(2 × 4)β2 top and GaAs(n 1 1)A (n = 2, 3 and 4) facet surfaces are investigated by empirical interatomic potentials with the aid of ab initio calculations. The calculated results imply that Ga adsorption energies strongly depend on the surface orientation, whereas As adsorption energies keep almost constant. The difference in adsorption energies can be interpreted by considering strain energy. In particular, Ga adatom is stabilized on the (3 1 1)A surface by the smallest strain energy forming interatomic bonds with three As atoms located at the regular fee sublattice. Furthermore, we roughly simulate resultant surface profile of GaAs thin films on non-planar surface consisting of the (0 0 1)-(2 × 4)β2 top and (n 1 1)A facet surfaces based on the rate equation. The simulated results reveal that the non-planar surface consisting of the (0 0 1)-(2 × 4)β2 top and (3 1 1)A facet surfaces forms unique surface profile because of preferential Ga adsorption on the (3 1 1)A and Ga migration from the (0 0 l)-(2 × 4)β2 toward (3 1 1)A. Consequently, growth on the (3 1 1)A facet surface exhibits a unique cross sectional surface profile compared with that on the non-planar surfaces consisting of (2 1 1)A and (4 1 1)A facet surfaces.

Original languageEnglish
Pages (from-to)206-212
Number of pages7
JournalApplied Surface Science
Volume237
Issue number1-4
DOIs
Publication statusPublished - Oct 15 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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