Energy band alignment at Cu<sub>2</sub>O/ZnO heterojunctions characterized by <i>in situ</i> x-ray photoelectron spectroscopy

Energy band alignment at Cu₂O/ZnO heterojunctions characterized by in situ x-ray photoelectron spectroscopy

Zhao Yan, Yin Hong-Bu, Fu Ya-Jun, Wang Xue-Min, Wu Wei-Dong^†

(a) XPS survey scan of Cu 2p_1/2 and Cu 2p_3/2 CL spectrum, (b) XAES of Cu LVV, (c) valence band spectrum, and (d) VBM determination of 100 nm-Cu₂O/100 nm-ZnO/c-Al₂O₃.