AVS 49th International Symposium
    Surface Science Tuesday Sessions
       Session SS3-TuA

Paper SS3-TuA7
Role of the Stress in the Epitaxy of Silver on the Basal Planes of Zinc Oxide

Tuesday, November 5, 2002, 4:00 pm, Room C-112C

Session: Metal/Oxide Surfaces
Presenter: J. Jupille, Groupe de Physique des Solides, France
Authors: J. Jupille, Groupe de Physique des Solides, France
S. Djanarthany, Laboratoire des Geosciences, France
D. Abriou, Laboratoire CNRS/Saint-Gobain, France
N. Jedrecy, Laboratoire Mineralogie-Cristallographie, France
R. Lazzari, CEA- Grenoble, France
G. Renaud, CEA- Grenoble, France
Correspondent: Click to Email
In general late transition metals and noble metals poorly wet oxide surface oxides. However, rather high values of the critical coverage (onset of the formation of the second atomic layer [Campbell, Surf. Sci. Rep. (1997)]) have been observed for platinum, copper and silver. The present paper reports on two different (0001)@sub ZnO@//(111)@sub Ag@ epitaxies for silver on the oxygen- and zinc-rich basal planes of zinc oxide. The [20-20]@sub ZnO@ //[220]@sub Ag@ orientation relation (OR I), corresponding to a misfit of + 2.75 %, is obtained on surfaces which are only prepared by annealing under oxygen. The [11-20]@sub ZnO@//[220]@sub Ag@ orientation relation (OR II, rotated by 30° with respect to OR I) is observed after an ion bombardment of the surfaces. It corresponds to a misfit of 11 %. The two epitaxies show both a perfect reproducibility and a good thermal stability. Low energy electron diffraction, transmission electron microscopy and X-ray diffraction (XRD) measurements demonstrate that (i) the ion bombardment strongly increases the size of the surface domains (narrowing of diffraction spots and rods) and that (ii) OR II, which corresponds to within 0.11 % to a 9Ag/8ZnO lattice coincidence, does not show any stress even at the onset of the film growth. It is concluded that the OR II is favoured by large ZnO domains while the OR I, which shows a better fit on short range, appears on surfaces of poor crystalline quality.