Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 34: Transport: Molecular Electronics (jointly with CPP, HL, MA)
TT 34.9: Vortrag
Mittwoch, 13. März 2013, 11:45–12:00, H2
Electron Transport properties of metallic carbon nanotubes with metal contacts — •Andreas Zienert1, Jörg Schuster2, and Thomas Gessner1,2 — 1Center for Microtechnologies, Chemnitz University of Technology, Chemnitz, Germany — 2Fraunhofer Institute for Electronic Nano Systems, Chemnitz, Germany
Metallic carbon nanotubes (CNTs) are quasi ballistic one-dimensional conductors capable to carry large current densities. This makes them ideal candidates for applications in future microelectronic devices, partially replacing state-of-the-art copper interconnect lines. The performance of such a system not only depends on intrinsic properties of the CNTs but is also strongly affected by its size and the contact.
We investigate the transport properties of metal–CNT–metal devices theoretically, applying semiempirical (extended Hückel theory) and ab initio (density functional theory) electronic structure methods, combined with a Green’s function formalism for ballistic transport at low bias. The study focuses on (6,0) CNTs of different length comparing the metal contacts Al, Cu, Pd, Pt, Ag, Au in a highly symmetric end-to-end configuration.
It turns out that Al forms the most transparent contacts, followed by Pd, Pt and Cu. The noble metals Au and Ag perform worse. Results are visualized and discussed in terms of the local density of states of the combined metal–nanotube systems and its isolated parts, as well as their contact distances, binding energies, and work functions.