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 †
       

XPS survey scan of 100 nm-ZnO/c-Al2O3 (a) Zn 2p3/2 CL spectrum; (b) valence band spectrum, with inset showing VBM determination.