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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 …
Tsinghua Press
Publication date: 
1 Oct 2010

Fauzia Jabeen, Silvia Rubini, Faustino Martelli, Alfonso Franciosi, Andrei Kolmakov, Luca Gregoratti, Matteo Amati, Alexei Barinov, Andrea Goldoni, Maya Kiskinova

Biblio References: 
Volume: 3 Issue: 10 Pages: 706-713
Nano Research