Figure 4

(a) Open-circuit voltage (\({V}_{{\rm{oc}}}\)) versus the width and height of the metallic grating. (b) Filling factor (FF) versus the width and height of the metallic grating. (c) Cell efficiency (\(\eta \)) versus the width and height of the metallic grating. Efficiency of the cell for different values of the height (d) and width (e) of the grating.