Journal
APPLIED PHYSICS LETTERS
Volume 97, Issue 23, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3525159
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The electronic band structure and the work function of MgO thin films epitaxially grown on Ag(001) have been investigated using x-ray and ultraviolet photoelectron spectroscopy for various oxide thicknesses. The deposition of thin MgO films on Ag(001) induces a strong diminution in the metal work function. The p-type Schottky barrier height is constant at 3.85 +/- 0.10 eV above two MgO monolayers and the experimental value of the ionization potential is 7.15 +/- 0.15 eV. Our results are well consistent with the description of the Schottky barrier height in terms of the Schottky-Mott model corrected by an MgO-induced polarization effect. (C) 2010 American Institute of Physics. [doi:10.1063/1.3525159]
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