Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 49: Metal Substrates III: Structure, Epitaxy and Growth

O 49.2: Vortrag

Mittwoch, 3. April 2019, 10:45–11:00, H5

Electronic structure and property of ZnO/Ag(111): A combined study of UPS, LEED and STM — •Ting-Chieh Hung and Karina Morgenstern — Chair of Physical Chemistry I, Ruhr-University of Bochum, Germany

Zinc Oxide (ZnO) is a broad bandgap semiconductor, which is widely used as a catalyst. Therefore, the properties of ZnO have been investigated extensively. However, the microscopic views and properties of ZnO ultrathin film supported by metal single crystal have remained unexplored. We investigate the shifting and broadening of the surface state of Ag(111) with increasing ZnO coverage by ultraviolet spectroscopy (UPS). The UPS surface state results reveal an increasing intensity of the ZnO peak with increasing ZnO coverages, while the intensity of the Ag peak decreases. The low energy electronic diffraction (LEED) pattern shows the orientation of ZnO(0001) on Ag(111) with a lattice constant of (335± 1) pm. We also confirmed the Moiré pattern of ZnO(0001) on Ag(111) [1] by our room temperature scanning tunneling microscopy (STM). Further STM results will be presented in this talk.

[1] Q. Pan et al, Catalysis Letters, 2014, 144(4), 648-655.