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- W1967144964 abstract "We report on the formation of high-barrier Ti and Ni contacts to (NH4)2Sx-treated ZnO films grown by pulsed-laser deposition. The x-ray photoelectron spectroscopy (XPS) results show that the position of the Zn 3d core-level peak at the (NH4)2Sx-treated ZnO surface is the same as that at the Ti/(NH4)2Sx-treated ZnO or Ni/(NH4)2Sx-treated ZnO interfaces, suggesting the occurrence of Fermi-level (EF) pinning and the formation of a barrier height of ∼2.7eV. From the photoluminescence and XPS measurements, it is suggested that a high Zn-vacancy density might cause the ZnO EF to be pinned close to the Zn-vacancy defect level at approximately 0.7eV above the valence band maximum. In addition, the discrepancy in barrier-height values obtained from XPS and current‐voltage measurements suggests the formation of S‐Zn surface dipoles with S atoms on the surfaces. (Some figures in this article are in colour only in the electronic version)" @default.
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- W1967144964 date "2009-03-20" @default.
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- W1967144964 title "High-barrier rectifying contacts on undoped ZnO films with (NH<sub>4</sub>)<sub>2</sub>S<sub><i>x</i></sub>treatment owing to Fermi-level pinning" @default.
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