fig3
Figure 3. (A) Survey XPS spectra of the ACO electrode; XPS spectra of (B) Ga 3d peaks; (C) Cu 3d peaks; (D) XRD pattern; and (E and F) Raman spectra and photoluminescence spectra of the ACO electrode. ACO: Annealed Cu-Oxide; XPS: X-ray photoelectron spectroscopy; XRD: X-ray diffractometer.
