Figure 1
From: Difference in gating and doping effects on the band gap in bilayer graphene
Two methods to generate an electric field. (a) Double-gate method; positive bottom- and negative top-gate voltages produce an upward electric field (left). Energy band diagrams of 2DM and two gate electrodes are illustrated before (middle) and after (right) applying gate voltages. The origin of the electric field is the potential difference between two gate electrodes. (b) Double-dope method; electron-donor SAMs and electron-acceptor molecules can produce an upward electric field (left). Energy band diagrams of 2DM, SAMs and molecules are illustrated before (middle) and after (right) electron transfer. The origin of the electric field is the Fermi level alignment of 2DM, SAMs and the molecules. (c) Schematic of device structure used in this study. BLG is placed on NH2-SAMs. Four-terminal conductivity is compared before and after the deposition of F4TCNQ molecules. Molecular structures of F4TCNQ and NH2-SAMs are shown.
