Reduced Contact Resistance Between Metal and n-Ge by Insertion of ZnO with Argon Plasma Treatment

XPS spectra for valence bands of ZnO/Ge sample. a Zn 2p and b valence band spectra for thick ZnO sample c ZnO 2p and d Ge 3d spectra for ZnO/Ge interface sample, and e Ge 3d and f valence band spectra for bulk Ge sampl