Ballistic Transport in Metallic Nanotubes with Reliable Pd Ohmic Contacts

By D. Mann, Ali Javey, J. Kong, Qian Wang, Hongjie Dai. 2003

401 citations recorded by the source corpus.

Contacting metallic single-walled carbon nanotubes by palladium (Pd) affords highly reproducible ohmic contacts and allows for the detailed elucidation of ballistic transport in metallic nanotubes. The Pd ohmic contacts are more reliable than the titanium (Ti) previously used for ballistic nanotube devices. In contrast, Pt contacts appear to give nonohmic contacts to metallic nanotubes. For both ohmic and nonohmic contacts, the length of the nanotube under the metal contact area is electrically turned off. Transport occurs from metal to nanotube at the edges of the contacts. Measurements with large numbers of Pd-contacted nanotube samples reveal that the mean free path for defect scattering in SWNTs grown by chemical vapor deposition can be up to 4 Im. The mean free paths for acoustic phonon scattering are on the order of 500 nm at room temperature and .4 Im at low temperatures. Ohmic contacts with minimum contact resistance are important to the fundamental characterization and realization of high-performance devices of electronic materials. Ohmic contacts to individual metallic single-walled carbon nanotubes (m-SWNTs) by Cr and Ti have enabled the observation

Subfields: Computational Mechanics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/116b8dfda34c87b55bb023848c039d5af10adfc5

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In Materials Chemistry

1. H. Philip Wong
2. Jie Deng
3. James D. Meindl
4. A. Naeemi
5. Andrea Alù
6. Pai-Yen Chen
7. Kaustav Banerjee
8. Hong Li

Citations in the corpus

• A Compact SPICE Model for Carbon-Nanotube Field-Effect Transistors Including Nonidealities and Its Application—Part I: Model of the Intrinsic Channel Region (2007, background): “We consider three typical scattering mechanisms in the channel region: 1) acoustic phonon scattering (near-elastic process [5]); 2) optical phonon scattering (inelastic process [4]); and 3) elastic scattering.”
• Atomically thin surface cloak using graphene monolayers. (2011, background): “5 ps, which is consistentwith the ballistic transport features of graphene, whose mean free path was measured to be up to 500 nm at room temperature and larger than 4 μm at low temperature.(23,24) The first term in eq 1 corresponds to the intraband electron photon scattering process, which can be ev”
• Performance Modeling for Single- and Multiwall Carbon Nanotubes as Signal and Power Interconnects in Gigascale Systems (2008, background): “Palladium contacts form reliable, reproducible, and low-resistance connections to SWNTs [ 29 ].”
• A Compact SPICE Model for Carbon-Nanotube Field-Effect Transistors Including Nonidealities and Its Application—Part II: Full Device Model and Circuit Performance Benchmarking (2007, background): “BALLISTIC or near-ballistic transport is observed with intrinsic carbon nanotube (CNT) under low voltage bias because of the ultralong (∼1 μm) scattering mean free path (MFP) [2]–[5].”