access icon free Electronic transport in carbon nanotube–graphene contact

An investigation has been conducted into the electron transport properties in carbon nanotube (CNT)–graphene contacts with a fully non-equilibrium Green's functions method combined with the density functional theory. Four different models are considered, where the contact geometries are varied. Their similar electron transmission characteristics are demonstrated with little dependence on the contact conditions at high energy and considerable dependence at low energy. The vacuum gap hinders the electron transport, resulting in an additional contact barrier. The electron transmission is mainly performed between the boundary carbon atoms of the CNT and the nearest graphene atoms, and the imperfection of the edge carbon atoms in a hexagonal lattice destroys the ballistic transport in graphene and the CNT at the contact. The current–voltage characteristics are presented as well. This reported work gives an insight into the electronic transport properties of the contacts and suggests that graphene is a suitable electrode material for applications in full-CNT devices.

Inspec keywords: graphene; ballistic transport; carbon nanotubes; electrical contacts; density functional theory; Green's function methods

Other keywords: carbon nanotube–graphene contact; contact geometries; current–voltage characteristics; density functional theory; hexagonal lattice; electron transport properties; electron transmission characteristics; boundary carbon atoms; fully nonequilibrium Green’s functions method; ballistic transport; C−C

Subjects: Ballistic transport; Electrical properties of interfaces; Electrical properties of graphene and graphene-related materials (thin films, low-dimensional and nanoscale structures); Electrical contacts; Fullerene, nanotube and related devices

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http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2014.0253
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