Modulation of WN x/Ge Schottky barrier height by varying N composition of tungsten nitride |
XPS spectra of W 4f and N 1s for the WN x films prepared with different Ar/N2 flow rates. (a) W 4f, Ar : N2 = 50 : 18, (b) N 1s, Ar : N2 = 50 : 18, (c) W 4f, Ar : N2 = 50 : 25, (d) N 1s, Ar : N2 = 50 : 25, (e) W 4f, Ar : N2 = 50 : 35, (f) N 1s, Ar : N2 = 50 : 35. |