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Graphene-carbon nanotube device. The nanotube is (8,0) and the graphene is aligned along the zigzag direction with an overlap region of 10 Å. The boxes indicate scattering and electrode regions with the electrode regions highlighted in green.
Charge transfer between graphene and an (8,0) nanotube. Self-consistent density is obtained for the case of the nanotube far away from the graphene and the case of the graphene and nanotube separated by . The system is periodic along the nanotube axis. Blue indicates an excess of charge and yellow a depletion.
Calculated current-voltage response for various CNT-graphene junctions. The low-bias transmission spectrum is integrated to obtain the IV curves. Curves with (8,0) and (10,0) nanotubes with a 5 Å and 10 Å of overlap with the graphene are shown (see Figure 1).
Properties of nanotubes: is the calculated band gap, d is the nanotube diameter, and is the p-type Schottky barrier.
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