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Surface-Effect-Induced Optical Bandgap Shrinkage in GaN Nanotubes

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Title
Surface-Effect-Induced Optical Bandgap Shrinkage in GaN Nanotubes
Author(s)
Park Y.S.; Lee G.; Holmes M.J.; Chan C.C.S.; Reid B.P.L.; Alexander-Webber J.A.; Nicholas R.J.; Taylor R.A.; Kim K.S.; Sang W. Han; Yang W.; Jo Y.; Kim J.; Im H.
Subject
density functional theory, ; nanotube, ; photoluminescence, ; self-assembling nanostructures, ; semiconductor, ; surface effects
Publication Date
2015-06
Journal
NANO LETTERS, v.15, no.7, pp.4472 - 4476
Publisher
AMER CHEMICAL SOC
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 ∼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. © 2015 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/1995
DOI
10.1021/acs.nanolett.5b00924
ISSN
1530-6984
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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