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

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons22134

Stavale,  Fernando
Chemical Physics, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons32647

Pascua,  Leandro
Chemical Physics, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21916

Nilius,  Niklas
Chemical Physics, Fritz Haber Institute, Max Planck Society;
Carl von Ossietzky Universität Oldenburg, Institut für Physik;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21524

Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Zitation

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.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0014-623E-B
Zusammenfassung
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.