Raman fingerprint of charged impurities in graphene

@inproceedings{Casiraghi2007RamanFO,
  title={Raman fingerprint of charged impurities in graphene},
  author={Cinzia Casiraghi and Simone Pisana and Kostya S. Novoselov and Andre K. Geim and Andrea C. Ferrari},
  year={2007}
}
  • Cinzia Casiraghi, Simone Pisana, +2 authors Andrea C. Ferrari
  • Published 2007
  • Physics
  • We report strong variations in the Raman spectra for different single-layer graphene samples obtained by micromechanical cleavage. This reveals the presence of excess charges, even in the absence of intentional doping. Doping concentrations up to ∼1013cm−2 are estimated from the G peak shift and width and the variation of both position and relative intensity of the second order 2D peak. Asymmetric G peaks indicate charge inhomogeneity on a scale of less than 1μm. 

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