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AFM image of graphene obtained by the CVD method on an on-axis 4H-SIC (0001) substrate (inset). The surface profile obtained along the line perpendicular to the steps reveals step edges of about 5-10 nm in height and relatively flat 2-5 μm wide terraces.
AFM (a) and KPFM (b) images of the same 50 × 50 μm surface area of graphene obtained on a 4H-SiC (0001) substrate.
Micro-Raman spectra of the G and 2D bands measured at two different places on the terrace (black and red points) and on the step edge (green points). Solid lines – Lorentzian fits the experimental data.
Color-coded map of the spatial distribution of the 2D band position across the step edge and the terrace region (1 × 3 μm).
Micro-Raman linear scan showing variations in the position of the G, 2D and 2D band integrated intensity over the step edges and the terraces at a 30 μm distance.
AFM image of the step edge region. Puckers on the step edge, pointed by arrows, indicate larger thickness in this region.
Statistical correlation between the energy of the G and 2D band positions obtained from the analysis of micro-Raman maps. The red loop indicates data corresponding to terrace regions.
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