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Abstract: We report strong variations in the Raman spectra for different single-layergraphene samples obtained by micromechanical cleavage, which reveals thepresence of excess charges, even in the absence of intentional doping. Dopingconcentrations up to ~10^13 cm-2 are estimated from the G peak shift and width,and the variation of both position and relative intensity of the second order2D peak. Asymmetric G peaks indicate charge inhomogeneity on the scale of lessthan 1 micron.



Author: C. Casiraghi, S. Pisana, K. S. Novoselov, A. K. Geim, A. C. Ferrari

Source: https://arxiv.org/



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