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George T. Wang

Sandia National Laboratories' Solid State Lighting Energy Frontier Research Center

Dr. George T. Wang

gtwang@sandia.gov
Sandia National Laboratories
P.O. Box 5800, MS-1086
Albuquerque, NM 87185
Office: (505) 284-9212
Fax: (505) 844-3211
Last Updated 1/2011

SSLS EFRCSSLS EFRC

Dr. George T. Wang Research Research Navigation Bar 3D Templated Growth Nanowire Synthesis Nanowire Characterization Nanowire Devices 3D Templated Growth

Nanowire Characterization

We employ a variety of nanocharacterization techniques to understand and ultimately improve the nanowire properties. For example, spatially-resolved cathodoluminescence experiments are being used to map the frequencies and intensities of light emission from these nanowires with nanoscale resolution, as shown in the accompanying figure. This and other optical techniques that have with our collaborators been adapted to studying these nanostructures, including 3D electron tomography, near-field scanning microscopy and ultrafast and deep-level optical spectroscopies, have revealed details such as the origin and concentration of impurities and other point defects in the nanowires, with the goal of reducing them and their impact on nanowire-based devices.

Selected Publications

Q. M. Li, G. T. Wang, "Strain influenced indium composition distribution in GaN/InGaN core-shell nanowires", Appl. Phys. Lett., 97, 181107 2010.[link]

A. Armstrong, Q. Li, Y. Lin, A. A. Talin, G. T. Wang, "GaN nanowire surface state observed using deep level optical spectroscopy", Appl. Phys. Lett., 96,2010. [link]

Q. M. Li, G. T. Wang, "Spatial Distribution of Defect Luminescence in GaN Nanowires", Nano Lett., 10, 1554 2010. [link]

I. Arslan, A. A. Talin, and G. T. Wang, “Three-Dimensional Visualization of Surface Defects in Core-Shell Nanowires,” Journal of Physical Chemistry C 112, 1109311097 (2008). [link]

Cathodoluminescense (CL) Showing multi-color InGaN emmision
Cathodoluminescence (CL)
Showing multi-color InGaN emission
3D Scanning TEM
3D scanning transmission electron microscopy (TEM)
Double heterostructure nanowire
GaN/AlGaN/GaN Double heterostructure nanowire

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