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(Color online) XPS spectra of the pure materials (a) GaN, (b) ZnO, and (c) Cu2O. The insets show the XPS spectra of the heterostructures (a) Cu2O/GaN and (b) Cu2/ZnO.
(Color online) Determination of the valence band maximum by linear extrapolation with two functions. High resolution XPS valence band spectra (insets) of the bulk materials (a) GaN, (b) ZnO, and (b) Cu2O were used.
(Color online) Band alignment for the heterostructures ZnO/GaN, Cu2O/GaN, and Cu2O/ZnO.
Binding energies for the core level, VBM, and the band gap energy.
Band offsets for the heterostructures.
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