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Micro-Raman spectroscopy of graphene grown on stepped 4H-SiC (0001) surface
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View: Figures


Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

AFM (a) and KPFM (b) images of the same 50 × 50 μm surface area of graphene obtained on a 4H-SiC (0001) substrate.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

Color-coded map of the spatial distribution of the 2D band position across the step edge and the terrace region (1 × 3 μm).

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

AFM image of the step edge region. Puckers on the step edge, pointed by arrows, indicate larger thickness in this region.

Image of FIG. 7.
FIG. 7.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Micro-Raman spectroscopy of graphene grown on stepped 4H-SiC (0001) surface