NIST Demonstrates New Nanoelectronic Switch
April 9, 2007 // Published as a news service by IHS
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Researchers at the National Institute of Standards and Technology (NIST) demonstrated a prototype nanoscale electronic switch built from self-assembled layers of organic molecules on silver wires.
Reported in Applied Physics Letters, potential applications for their proof-of-concept experiments range from a replacement technology for magnetic data storage to integrated circuit (IC) memory devices.
Silver would be a natural choice for nanoscale and microscale electrical contacts because of its high conductivity, but experts said it has one notorious drawback. In an electric field, silver ions readily form silver "whiskers," tree-like branching growths of crystals that can short out microelectronic devices.
Two NIST researchers demonstrated this can be a "feature," not a "bug," in an experiment that uses this growth to make a nanoscale binary switch. In the experiment, an extremely fine silver wire is coated with a molecule that forms a self-assembled monolayer on the wire, typically some organic molecule with a sulfur group on one end to bond to the silver.
An equally fine gold wire is laid crosswise to the silver wire and a small voltage is applied across the two. When the voltage is increased to a critical level, silver ions form and quickly branch through the organic monolayer to the gold wire just like a lightning bolt - except solid.
When a silver filament reaches the gold, it forms a short-circuit, causing a dramatic, yet easily detectable change in conductance. Reversing the voltage retracts the filament and "opens" the switch.
As a candidate logic switch for nanoscale memory circuits and similar devices, researchers said the silver whisker switch has several attractive features:
- The chemistry of the organic monolayer is not critical; the switch works with many different molecules and can be used with many different self-assembled molecular electronics systems.
- The crossed-wire structure is simple to engineer and lends itself to large arrays of switches.
- The difference between “on” and “off” is huge - electrical resistance ratios of a million or more. This makes it easier to reliably scale up the technology to large arrays.
Problems to be overcome, according to researchers, include volatility - the voltage has to be kept on to retain the switch state, slow switching speeds - about 10 kHz in the prototype and a tendency of the switch to freeze permanently closed after a large number of cycles.
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NIST has applied for a patent on the switch.
Source: National Institute of Standards and Technology (NIST).