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) Cross-section SEM image, (b) HRTEM of Cu2O/ZnO interface, (c)–(e) cross-section element mapping by EDS of Cu2O/ZnO heterojunction sample.