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

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2 Author(s)
Gu, Y. ; Department of Materials Science and Engineering, Northwestern University, Illinois 60208 and Materials Research Center, Northwestern University, Illinois 60208 ; Lauhon, L.J.

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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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Applied Physics Letters  (Volume:89 ,  Issue: 14 )