Carbon Nanotube Memory Ricky Taing. Outline Motivation for NRAM Comparison of Memory NRAM Technology Carbon Nanotubes Device Operation Evaluation Current.

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Presentation transcript:

Carbon Nanotube Memory Ricky Taing

Outline Motivation for NRAM Comparison of Memory NRAM Technology Carbon Nanotubes Device Operation Evaluation Current State of NRAM Fabrication Conclusions

Motivations and Goals Physical limitations of current memory Threshold voltage scaling, soft error Low power for mobile devices Universal memory Fast, dense, non-volatile, low energy

Comparison - Current Tech Size compared to DRAM Speed compared to SRAM Energy compared to Flash limited lifetime for flash

Comparison - Future Tech MRAM (Magnetic Memory) Insulator separated magnetic plates Changing polarity causes high or low resistance across insulator size limit being reached, larger than flash FRAM (Ferroelectric Memory) replace capacitor with Ferroelectric crystal in use unlimited writes smallest possible size larger than NRAM Josephson based

NRAM Technology Carbon Nanotubes cylindrical carbon molecules extremely strong (52x carbon steel) SWNT conductors composite fibers: 600 J/g to break 4x spider silk, 18x Kevlar fiber “Gecko strength” 200x as sticky

NRAM Technology

Device Overview

NRAM Technology On/Off States Potential Energy Van der Waals interactions Keeps state w/o current Threshold: 4.5V(on) and 20V(off)

NRAM

NRAM Technology Data Access OFF: high resistance ON: low resistance 100GHz operations for 10nm element

NRAM

NRAM Technology Calculations Stable at room temperature States hold for a variety of sizes Measurable resistance difference Bending force will not strain strain SWNT Small voltages Localized interactions

NRAM Technology Density 10^12 elements/cm^2 Speed current: 10x flash

Fabrication Work with fabrication companies Current tech Deposit nanotubes on chips Remove wrongly placed ones

Current State Nantero “ Made ground in the manufacturing process” Density 13 cm circular wafers - 10GB Future Space memory / BAE Problems? fabrication

Conclusion Stable, unlimited lifetime, instant on/standby, scalable “Universal” NRAM prototype devices in 2006