Space-charge-limited current in nanowires depleted by oxygen adsorption

Y. Gu; L. J. Lauhon

doi:10.1063/1.2358316

Space-charge-limited current in nanowires depleted by oxygen adsorption

Y. Gu, L. J. Lauhon^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

96 Scopus citations

Abstract

The effects of oxygen adsorption on the conductivity and carrier transport mechanisms in CdS nanowires were established through variable temperature electrical transport and photoconductivity measurements. n -type CdS nanowires were found to be significantly less conductive in the ambient air than in the vacuum due to electron depletion induced by adsorbed oxygen. The current-voltage characteristics of depleted nanowires exhibited a power law behavior consistent with space-charge-limited conduction in the presence of traps. Analysis of the voltage and temperature dependencies of the space-charge-limited current showed that the nanowire surface traps are exponentially distributed in energy with a characteristic depth of ∼0.28±0.04 eV.

Original language	English (US)
Article number	143102
Journal	Applied Physics Letters
Volume	89
Issue number	14
DOIs	https://doi.org/10.1063/1.2358316
State	Published - 2006

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.2358316

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title = "Space-charge-limited current in nanowires depleted by oxygen adsorption",

abstract = "The effects of oxygen adsorption on the conductivity and carrier transport mechanisms in CdS nanowires were established through variable temperature electrical transport and photoconductivity measurements. n -type CdS nanowires were found to be significantly less conductive in the ambient air than in the vacuum due to electron depletion induced by adsorbed oxygen. The current-voltage characteristics of depleted nanowires exhibited a power law behavior consistent with space-charge-limited conduction in the presence of traps. Analysis of the voltage and temperature dependencies of the space-charge-limited current showed that the nanowire surface traps are exponentially distributed in energy with a characteristic depth of ∼0.28±0.04 eV.",

author = "Y. Gu and Lauhon, {L. J.}",

note = "Funding Information: This work was supported by the National Science Foundation through the MRSEC program (DMR-0076097) at the Materials Research Center of Northwestern University and by the CAREER program (DMR-0449933). The authors thank Jessica L. Lensch and the support of the ACS-PRF for the nanowires used in this study. Use of the NIFTI facility of the NUANCE Center at Northwestern University is gratefully acknowledged.",

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doi = "10.1063/1.2358316",

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T1 - Space-charge-limited current in nanowires depleted by oxygen adsorption

AU - Gu, Y.

AU - Lauhon, L. J.

N1 - Funding Information: This work was supported by the National Science Foundation through the MRSEC program (DMR-0076097) at the Materials Research Center of Northwestern University and by the CAREER program (DMR-0449933). The authors thank Jessica L. Lensch and the support of the ACS-PRF for the nanowires used in this study. Use of the NIFTI facility of the NUANCE Center at Northwestern University is gratefully acknowledged.

PY - 2006

Y1 - 2006

N2 - The effects of oxygen adsorption on the conductivity and carrier transport mechanisms in CdS nanowires were established through variable temperature electrical transport and photoconductivity measurements. n -type CdS nanowires were found to be significantly less conductive in the ambient air than in the vacuum due to electron depletion induced by adsorbed oxygen. The current-voltage characteristics of depleted nanowires exhibited a power law behavior consistent with space-charge-limited conduction in the presence of traps. Analysis of the voltage and temperature dependencies of the space-charge-limited current showed that the nanowire surface traps are exponentially distributed in energy with a characteristic depth of ∼0.28±0.04 eV.

AB - The effects of oxygen adsorption on the conductivity and carrier transport mechanisms in CdS nanowires were established through variable temperature electrical transport and photoconductivity measurements. n -type CdS nanowires were found to be significantly less conductive in the ambient air than in the vacuum due to electron depletion induced by adsorbed oxygen. The current-voltage characteristics of depleted nanowires exhibited a power law behavior consistent with space-charge-limited conduction in the presence of traps. Analysis of the voltage and temperature dependencies of the space-charge-limited current showed that the nanowire surface traps are exponentially distributed in energy with a characteristic depth of ∼0.28±0.04 eV.

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Space-charge-limited current in nanowires depleted by oxygen adsorption

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