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HL: Fachverband Halbleiterphysik

HL 33: Poster I: Transport, including Magnetic-Field Effects

HL 33.4: Poster

Dienstag, 23. März 2010, 18:30–20:30, Poster D1

Electrical Properties of Graphene- Carbon Nanotube junction — •Pablo Thomas Robert, Julien Bordaz, Romain Danneau, and Frank Hennrich — Karlsruher Institut für Technologie, Campus Nord, Institut für Nanotechnologie

Since it has been in 2004 first isolated, it has become one of the hottest research topics in condensed matter physics. The peculiar band structure of this zero-gap semiconductor leads to novel electronics properties and mades it a high promising material for electronic devices. Our aim is to study the electrical transport properties of graphene-nanotube hybrid carbon systems by carrying out 4 point-probe measurements and the graphene/carbon nanotube interface resistance. We want to compare those measurements with the ones obtained when using the metal electrodes standard technique to connect the graphene sheet.

To fabricate our probes, we first deposit on highly doped silicon substrates some graphene by mechanical exfoliation of graphite. After spin-coating a multi-walled carbon nanotube solution on the probe, the nanotubes are then dragged on the graphene sheet using an atomic force microscope in non-contact mode. We also pattern metal contacts on the graphene sheet using standard electron beam lithography followed by ultra-high vacuum metal evaporation.