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Surface-Effect-Induced Optical Bandgap Shrinkage in GaN Nanotubes
- Authors
- Park, Young S.; Lee, Geunsik; Holmes, Mark J.; Chan, Christopher C. S.; Reid, Benjamin P. L.; Alexander-Webber, Jack A.; Nicholas, Robin J.; Taylor, Robert A.; Kim, Kwang S.; Han, Sang W.; Yang, Woochul; Jo, Y.; Kim, J.; Im, Hyunsik
- Issue Date
- Jul-2015
- Publisher
- AMER CHEMICAL SOC
- Keywords
- semiconductor; nanotube; self-assembling nanostructures; surface effects; photoluminescence; density functional theory
- Citation
- NANO LETTERS, v.15, no.7, pp 4472 - 4476
- Pages
- 5
- Indexed
- SCI
SCIE
SCOPUS
- Journal Title
- NANO LETTERS
- Volume
- 15
- Number
- 7
- Start Page
- 4472
- End Page
- 4476
- ISSN
- 1530-6984
1530-6992
- Abstract
- We investigate nontrivial surface effects on the optical properties of self-assembled crystalline GaN nanotubes grown on Si substrates. The excitonic emission is observed to redshift by similar to 100 meV with respect to that of bulk GaN. We find that the conduction band edge is mainly dominated by surface atoms, and that a larger number of surface atoms for the tube is likely to increase the bandwidth, thus reducing the optical bandgap. The experimental findings can have important impacts in the understanding of the role of surfaces in nanostructured semiconductors with an enhanced surface/volume ratio.
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Related Researcher
- Yang, Woo Chul
- College of Natural Science (Department of Physics)