“Carbon Nanotubes for Interconnect Applications”

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Presentation transcript:

“Carbon Nanotubes for Interconnect Applications” Franz Kreupl, Andrew P. Graham, Maik Liebau, Georg S. Duesberg, Robert Seidel, Eugen Unger Presented at IEDM 2004 EE C235 Presentation by Zachery Jacobson March 5, 2007

Outline Overview of Interconnects Why Carbon Nanotube interconnects? Growth strategies Results Issues Conclusions

Overview of Interconnects Increased resistance and decreased current carrying capability due to electromigration are two critical issues affecting the use of copper interconnects Ron Ho, SLIP 2005 ITRS Roadmap, 2005

Why Carbon Nanotube Interconnects? Metallic Carbon Nanotubes are potentially viable for use as interconnects due to their large mean-free path (which leads to low resistance) and low electromigration (which increases current carrying capability) A. Naeemi, et al, IEDM 2004 F. Kreupl, et al, IEDM 2004

Growth Strategies Two major growth strategies Bottom-up, where CNTs are grown before ILD deposition Buried catalyst, where CNTs are grown after ILD deposition J. Li, et al, Appl. Phys. Lett. 82, 2491 (2003) F. Kreupl, et al, IEDM 2004

Results Nanotube quality is better than PECVD grown nanotubes, but variability is still high F. Kreupl, et al, IEDM 2004

Results Relatively high annealing temperature needed to reduce resistance due to contact issues Large variability in resistance between vias F. Kreupl, et al, IEDM 2004

Issues Contact resistance eliminates any advantage seen versus “bulk” Cu interconnects To make a good low resistance contact, high annealing temperatures are required which exceed the thermal budget Variability of grown nanotubes continues to be an issue Large diameter nanotubes underperform Cu vias even under ideal conditions F. Kreupl, et al, IEDM 2004

Conclusions Thank you for your time! Questions? Carbon Nanotubes have theoretically higher performance than Copper interconnects in some applications Using a buried catalyst method, vias were fabricated using single MWCNTs down to 20 nm in diameter Variability was high among the nanowires grown, which has a strong effect on performance If good contacts can be achieved with a low temperature process, carbon nanotubes have a chance at replacing copper vias at very small process nodes Thank you for your time! Questions?