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Device Only Atoms Across May Allow Infinitesimal But Powerful Computers

Date:
April 4, 2006
Source:
National Science Foundation
Summary:
Using the power of modern computing combined with innovative theoretical tools, an international team of researchers has determined how a one-way electrical valve, or diode, made of only a single molecule does its job.

Researchers at the University of Chicago recently created a single-molecule diode only a few tens of atoms in size and 1,000 times smaller than its conventional counterparts. Theorists from the University of South Florida and the Russian Academy of Sciences recently determined how the device works. The researchers found electron energy levels in a molecule are efficient channels for transferring electrons from one electrode to another.
Credit: Trent Schindler, National Science Foundation

Using the power of modern computing combined with innovative theoretical tools, an international team of researchers has determined how a one-way electrical valve, or diode, made of only a single molecule does its job.

Diodes are critical components within computer, audio equipment and countless other electronic devices. If designers can swap existing diodes with the single-molecule one, the products could be shrunk to incredibly small sizes.

The technology may allow computer designers to sustain "Moore's Law"--a prediction made by Intel co-founder Gordon Moore in 1965--which suggested technological advances will allow a doubling every 18 months in the number of transistors that can fit on a computer chip. But the "law" has been nearing the end of its useful life as ever-shrinking silicon chips approach their physical limits.

Created by a research team at the University of Chicago, the single-molecule diode is merely a few tens of atoms in size and 1,000 times smaller than its conventional counterparts. Recently, theorists from the University of South Florida and the Russian Academy of Sciences have explained the principles that make the device work.

The researchers showed electron energy levels in a molecule are efficient channels for transferring electrons from one electrode to another. Because the molecule in the diode is asymmetrical, the electronic response is also asymmetrical when voltage is applied. The asymmetry contributes to a phenomenon called molecular rectification: the channels conduct electrons in one direction, but limit flow in the opposite direction when the voltage polarity reverses. That property makes the molecular diode a potential gatekeeper for circuits and a candidate to one day replace silicon in computer chips.

Researchers from all three institutions reported their findings in the March 10 issue of Physical Review Letters. The work was supported by several National Science Foundation grants.


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The above story is based on materials provided by National Science Foundation. Note: Materials may be edited for content and length.


Cite This Page:

National Science Foundation. "Device Only Atoms Across May Allow Infinitesimal But Powerful Computers." ScienceDaily. ScienceDaily, 4 April 2006. <www.sciencedaily.com/releases/2006/04/060403230648.htm>.
National Science Foundation. (2006, April 4). Device Only Atoms Across May Allow Infinitesimal But Powerful Computers. ScienceDaily. Retrieved October 21, 2014 from www.sciencedaily.com/releases/2006/04/060403230648.htm
National Science Foundation. "Device Only Atoms Across May Allow Infinitesimal But Powerful Computers." ScienceDaily. www.sciencedaily.com/releases/2006/04/060403230648.htm (accessed October 21, 2014).

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