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Breakdown current density of graphene nanoribbons
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View: Figures


Image of FIG. 1.
FIG. 1.

SEM image of a set of ten GNRs between each electrode pair. The GNRs (below HSQ lines) are 21-nm-wide between the middle electrode pair.

Image of FIG. 2.
FIG. 2.

curves of ten GNRs taken through electrical breakdown (a). Each GNR has a width of 22 nm and a length of . The curves are for a set of parallel GNRs—the top curve is for ten GNRs in parallel, the second curve from top for nine GNRs in parallel, and so on. The testing is stopped immediately after a breakdown event, followed by low-bias measurements of contact resistance (b). The breakdown current density of the ten GNRs is plotted in (c) with the units of .

Image of FIG. 3.
FIG. 3.

Breakdown current density vs resistivity; (a) shows a scatter plot with low-bias resistivity plotted on the -axis—the for this fit is 74%; (b) shows a scatter plot for breakdown current density vs high-bias resistivity; the for this fit is 86%. The fit for both the plots is of the form where . If the breakdown mechanism was Joule heating, theory predicts that the exponent in the fit (b) should be 0.5; a steeper exponent in the fit indicates that the breakdown occurs faster for higher-resistivity GNRs, and might be indicative of higher defect densities contributing to faster electrical breakdown.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Breakdown current density of graphene nanoribbons