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

MPS-Authors
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Bieniek,  Björn
Theory, Fritz Haber Institute, Max Planck Society;

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Hofmann,  Oliver T.
Theory, Fritz Haber Institute, Max Planck Society;
Institute of Solid State Physics, Graz University of Technology;

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Rinke,  Patrick
Theory, Fritz Haber Institute, Max Planck Society;
School of Science, Aalto University;

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bieniek_paper_ZnO_revised.pdf
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Citation

Bieniek, B., Hofmann, O. T., & Rinke, P. (2015). Influence of hydrogen on the structure and stability of ultra-thin ZnO on metal substrates. Applied Physics Letters, 106(13): 131602. doi:10.1063/1.4917015.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0026-A9C4-A
Abstract
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 H2 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¯)−2×1−H surface.