Resistivity of Rotated Graphite-Graphene Contacts
| Autor: | Tarun Chari, Cory Dean, Rebeca Ribeiro-Palau, Kenneth L. Shepard |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Yield (engineering) Condensed matter physics Graphene Mechanical Engineering Bioengineering Nanotechnology 02 engineering and technology General Chemistry Edge (geometry) 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electrical contacts law.invention law Electrical resistivity and conductivity 0103 physical sciences General Materials Science Graphite 010306 general physics 0210 nano-technology Bilayer graphene Electrical conductor |
| Zdroj: | Nano letters. 16(7) |
| ISSN: | 1530-6992 |
| Popis: | Robust electrical contact of bulk conductors to two-dimensional (2D) material, such as graphene, is critical to the use of these 2D materials in practical electronic devices. Typical metallic contacts to graphene, whether edge or areal, yield a resistivity of no better than 100 Ω μm but are typically >10 kΩ μm. In this Letter, we employ single-crystal graphite for the bulk contact to graphene instead of conventional metals. The graphite contacts exhibit a transfer length up to four-times longer than in conventional metallic contacts. Furthermore, we are able to drive the contact resistivity to as little as 6.6 Ω μm2 by tuning the relative orientation of the graphite and graphene crystals. We find that the contact resistivity exhibits a 60° periodicity corresponding to crystal symmetry with additional sharp decreases around 22° and 39°, which are among the commensurate angles of twisted bilayer graphene. |
| Databáze: | OpenAIRE |
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