Hydrogen in Ag-doped ZnO: theoretical calculations

Details Hydrogen in Ag-doped ZnO: theoretical calculations Hydrogen in Ag-doped ZnO: theoretical calculations

2009-05-08

arxiv.org/abs/0905.1184v1

J. Chem. Phys. 130, 204516 (2009)

Physics

Condensed Matter

Materials Science

5 pages, 4 figures, accepted by J. Chem. Phys

Scientific paper

Based on density functional theory calculations, we systematically investigate the behaviors of a H atom in Ag-doped ZnO, involving the preference sites, diffusion behaviors, the electronic structures and vibrational properties. We find that a H atom can migrate to the doped Ag to form a Ag-H complex by overcoming energy barriers of 0.3 - 1.0 eV. The lowest-energy site for H location is the bond center of a Ag-O in the basal plane. Moreover, H can migrate between this site and its equivalent sites with energy cost of less than 0.5 eV. In contrast, dissociation of such a Ag-H complex needs energy of about 1.1 - 1.3 eV. This implies that the Ag-H complexes can commonly exist in the Ag-doped ZnO, which have a negative effect on the desirable p-type carrier concentrations of Ag-doped ZnO. In addition, based on the frozen phonon calculation, the vibrational properties of ZnO with a Ag-H complex are predicted. Some new vibrational modes associated with the Ag-H complex present in the vibrational spectrum of the system.

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