Fig. 2: Uniformity of transferred graphene.
From: Integrated wafer-scale ultra-flat graphene by gradient surface energy modulation
a, b Spatial sheet resistance maps of GSE-transferred graphene (a) and PMMA-transferred graphene (b) on 4-inch SiO2/Si wafer. Note that the sheet resistance deviation of GSE-transferred graphene is ~6%. c, d Spatial G-peak’s position maps of GSE-transferred (c) and PMMA-transferred (d) graphene. The peak position of G-band of PMMA-transferred graphene is blue shifted. e Correlation map of the Raman G and 2D peak positions of GSE- and PMMA-transferred graphene. A total of 225 Raman spectra were taken from each type of transferred graphene. The yellow star represents the G and 2D peak positions of the pristine graphene with neither doping nor strain. f 2D peak’s full width at half maximum (Γ2D) of GSE- and PMMA-transferred graphene. The solid lines are fitting lines of distribution function for Γ2D.
