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(a) Wide scan X-ray photoelectron spectroscopy (XPS) spectra of ZnO SLs annealed in three different ambients; (b) High resolution spectra of Zn-2p of the SLs; O1s core level spectra obtained from the ZnO SLs annealed in (c) vacuum; (d) air, and (e) nitrogen ambient are de-convoluted into three distant satellite peaks.
