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Nat Mater. 2008 Dec;7(12):966-71. doi: 10.1038/nmat2331. Epub 2008 Nov 16.

Electronic two-terminal bistable graphitic memories.

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Department of Chemistry, Rice University, MS 222, 6100 Main Street, Houston, Texas 77005, USA.


Transistors are the basis for electronic switching and memory devices as they exhibit extreme reliabilities with on/off ratios of 10(4)-10(5), and billions of these three-terminal devices can be fabricated on single planar substrates. On the other hand, two-terminal devices coupled with a nonlinear current-voltage response can be considered as alternatives provided they have large and reliable on/off ratios and that they can be fabricated on a large scale using conventional or easily accessible methods. Here, we report that two-terminal devices consisting of discontinuous 5-10 nm thin films of graphitic sheets grown by chemical vapour deposition on either nanowires or atop planar silicon oxide exhibit enormous and sharp room-temperature bistable current-voltage behaviour possessing stable, rewritable, non-volatile and non-destructive read memories with on/off ratios of up to 10(7) and switching times of up to 1 micros (tested limit). A nanoelectromechanical mechanism is proposed for the unusually pronounced switching behaviour in the devices.


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