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Contactless monitoring of the diameter-dependent conductivity of GaAs nanowires

Jabeen, Fauzia and Rubini, Silvia and Martelli, Faustino and Franciosi, Alfonso and Kolmakov, Andrei and Gregoratti, Luca and Amati, Matteo and Barinov, Alexei and Goldoni, Andrea and Kiskinova, Maya (2010) Contactless monitoring of the diameter-dependent conductivity of GaAs nanowires. Nano Research, 3 (10). pp. 706-713.


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Contactless monitoring with photoelectron microspectroscopy of the surface potential along individual nanostructures, created by the X-ray nanoprobe, opens exciting possibilities to examine quantitatively size- and surface-chemistry-effects on the electrical transport of semiconductor nanowires (NWs). Implementing this novel approach-which combines surface chemical microanalysis with conductivity measurements-we explored the dependence of the electrical properties of undoped GaAs NWs on the NW width, temperature and surface chemistry. By following the evolution of the Ga 3d and As 3d core level spectra, we measured the position-dependent surface potential along the GaAs NWs as a function of NW diameter, decreasing from 120 to ?20 nm, and correlated the observed decrease of the conductivity with the monotonic reduction in the NW diameter from 120 to ~20 nm. Exposure of the GaAs NWs to oxygen ambient leads to a decrease in their conductivity by up to a factor of 10, attributed to the significant decrease in the carrier density associated with the formation of an oxide shell.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:9878
Deposited By:JNCASR
Deposited On:26 Nov 2010 05:40
Last Modified:26 Nov 2010 05:40

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