Fig. 2: Analysis of surface morphology of different heterostructures with CuO_x and C₆₀ over layers.

AFM topography of a WCF1, b WCF2, c WCF3, d WCF4, e WCFO1, f WCFO2, g WCFO3, and h WCFO4 heterostructures. Scale bars correlating the color to the height are shown to the right of each image.