The screening of charged impurities in bilayer graphene

Wenjing Zhang, Lain-Jong Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Positively charged impurities were introduced into a bilayer graphene (BLG) transistor by n-doping with dimethylformamide. Subsequent exposure of the BLG device to moisture resulted in a positive shift of the Dirac point and an increase of hole mobility, suggesting that moisture could reduce the scattering strength of the existing charged impurities. In other words, moisture screened off the 'effective density' of charged impurities. At the early stage of moisture screening the scattering of hole carriers is dominated by long-range Coulomb scatter, but an alternative scattering mechanism should also be taken into consideration when the effective density of impurities is further lowered on moisture exposure.

Original languageEnglish (US)
Article number103037
JournalNew Journal of Physics
Volume12
DOIs
StatePublished - Oct 20 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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