Effect of ozone exposure on the electrical characteristics of high-purity, large-diameter semiconducting carbon nanotubes

Literature Information

Publication Date 2014-04-08
DOI 10.1039/C4CP00665H
Impact Factor 3.676
Authors

Jia Gao, Yueh-Lin Loo


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Abstract

In this study, we have elucidated the interactions between ozone and carbon nanotubes by monitoring the characteristics of field-effect transistors based on polymer-sorted, large-diameter semiconducting carbon nanotubes. The drain–source current of these transistors initially increases with ozone exposure and then it progressively decreases with increasing exposure beyond 3 min. This non-monotonic dependence of the drain–source current can be ascribed to two competing processes. At short ozone exposure, p-doping of carbon nanotubes dominates; the drain–source current thus increases as a result of increasing hole concentration. This effect is most evidenced in a progressive threshold voltage shift towards positive voltages with increasing exposure to ozone. At extended ozone exposure, chemical oxidation of carbon nanotubes instead dominates. The drain–source current decreases as a result of decreasing hole mobility. This effect manifests itself in a monotonic decrease in the mobility of these devices as a function of ozone exposure.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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