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Title: Influence of hydrogen on the structure and stability of ultra-thin ZnO on metal substrates

We investigate the atomic and electronic structure of ultra-thin ZnO films (1 to 4 layers) on the (111) surfaces of Ag, Cu, Pd, Pt, Ni, and Rh by means of density-functional theory. The ZnO monolayer is found to adopt an α-BN structure on the metal substrates with coincidence structures in good agreement with experiment. Thicker ZnO layers change into a wurtzite structure. The films exhibit a strong corrugation, which can be smoothed by hydrogen (H) adsorption. An H over-layer with 50% coverage is formed at chemical potentials that range from low to ultra-high vacuum H{sub 2} pressures. For the Ag substrate, both α-BN and wurtzite ZnO films are accessible in this pressure range, while for Cu, Pd, Pt, Rh, and Ni wurtzite films are favored. The surface structure and the density of states of these H passivated ZnO thin films agree well with those of the bulk ZnO(0001{sup ¯})-2×1-H surface.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3]
  1. Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin (Germany)
  2. (Austria)
  3. (Finland)
Publication Date:
OSTI Identifier:
22398808
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ADSORPTION; BORON NITRIDES; COPPER; CRYSTAL STRUCTURE; DENSITY FUNCTIONAL METHOD; DENSITY OF STATES; ELECTRONIC STRUCTURE; HYDROGEN; LAYERS; PHASE STABILITY; PLATINUM; POTENTIALS; RHODIUM; SILVER; SUBSTRATES; SURFACES; THIN FILMS; ZINC OXIDES