Figure 4
From: Photocapacitive CdS/WOx nanostructures for solar energy storage
XPS measurements from the CdS/WOx composite over the range 0–1200 eV (a), alongside higher-resolution measurements of the Cd 3d (b), S 2p (c), O 1 s (d), C 1 s (e) and W 4f (f) photoelectron peaks. Shirley-type fits to the secondary electron background of each photoelectron peak are plotted as dashed black lines, while the fitted Gaussian-Lorentzian peak components are depicted as solid coloured lines; components within the same peak doublet are assigned the same colour. It should be noted that due to differential charging between the CdS and WOx components, the carbon-correction applied to the peaks of CdS is likely unsuitable; for instance, the binding energy positions of the S 2p and Cd 3d peaks are approximately 0.5 eV higher than the corresponding values in Fig. 3.
