▎ 摘　　要

Raman characterizations show the G peak of an unintentional doped single crystal bilayer graphene (BLG) splits into two peaks: S and AS peaks. From the relative shift between S and AS peaks, the doping concentration is estimated to be from 8.8 x 10(12) cm(-2) to 2 x 10(13) cm(-2), as in the same order of that in monolayer graphene prepared under the same condition. The dopants distribute relatively homogeneously in a 0.7 mm x 0.3 mm large BLG judged through the G peak splitting. The 2D peak of heavy doped BLG can only be deconvoluted into three peaks, corresponding to 2D(1B), 2D(1A), and 2D(2A) peaks. (C) 2011 American Institute of Physics. [doi:10.1063/1.3666821]