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  Morphology and Luminescence of ZnO Films Grown on a Au(111) Support

Stavale, F., Pascua, L., Nilius, N., & Freund, H.-J. (2013). Morphology and Luminescence of ZnO Films Grown on a Au(111) Support. The Journal of Physical Chemistry C, 117(20), 10552-10557. doi:10.1021/jp401939x.

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 Creators:
Stavale, Fernando1, Author           
Pascua, Leandro1, Author           
Nilius, Niklas1, 2, Author           
Freund, Hans-Joachim1, Author           
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
2Carl von Ossietzky Universität Oldenburg, Institut für Physik, D-26111 Oldenburg, Germany, ou_persistent22              

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 Abstract: Using scanning tunneling microscopy and spectroscopy, we have analyzed the growth of ZnO thin films on a Au(111) support. Because of the 12% lattice mismatch with the metal beneath, ZnO develops a (0001)-oriented coincidence lattice that gives rise to a well-ordered hexagonal Moiré pattern with 2.2 nm periodicity. This superstructure disappears at 4 ML film thickness, when wide, atomically flat terraces delimited by straight monatomic steps become detectable in the STM. The long-range order of the films is deduced from sharp hexagonal spot patterns in low-energy electron diffraction. STM-based luminescence and conductance spectroscopy reveals that the ZnO band gap approaches the bulk value in films thicker than 10 ML. Additional photon peaks with sub-band-gap energies indicate the presence of defects in the wurzite lattice. The intrinsic polarity of the ZnO(0001) surface is accounted for by a reduced Zn–O interlayer distance and an adsorption-mediated compensation scheme in thin and thick films, respectively.

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Language(s): eng - English
 Dates: 2013-04-242013-02-252013-04-242013-04-242013-05-23
 Publication Status: Issued
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/jp401939x
 Degree: -

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Title: The Journal of Physical Chemistry C
  Other : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington DC : American Chemical Society
Pages: - Volume / Issue: 117 (20) Sequence Number: - Start / End Page: 10552 - 10557 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766