Surface-Effect-Induced Optical Bandgap Shrinkage in GaN Nanotubes

Young S. Park; Geunsik Lee; Mark J. Holmes; Christopher C.S. Chan; Benjamin P.L. Reid; Jack A. Alexander-Webber; Robin J. Nicholas; Robert A. Taylor; Kwang S. Kim; Sang W. Han; Woochul Yang; Y. Jo; J. Kim; Hyunsik Im

doi:10.1021/acs.nanolett.5b00924

Surface-Effect-Induced Optical Bandgap Shrinkage in GaN Nanotubes

Young S. Park, Geunsik Lee, Mark J. Holmes, Christopher C.S. Chan, Benjamin P.L. Reid, Jack A. Alexander-Webber, Robin J. Nicholas, Robert A. Taylor, Kwang S. Kim, Sang W. Han, Woochul Yang, Y. Jo, J. Kim, Hyunsik Im

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22 Scopus citations

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.

Original language	English
Pages (from-to)	4472-4476
Number of pages	5
Journal	Nano Letters
Volume	15
Issue number	7
DOIs	https://doi.org/10.1021/acs.nanolett.5b00924
State	Published - 8 Jul 2015

Keywords

density functional theory
nanotube
photoluminescence
self-assembling nanostructures
semiconductor
surface effects

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10.1021/acs.nanolett.5b00924

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title = "Surface-Effect-Induced Optical Bandgap Shrinkage in GaN Nanotubes",

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.",

keywords = "density functional theory, nanotube, photoluminescence, self-assembling nanostructures, semiconductor, surface effects",

author = "Park, {Young S.} and Geunsik Lee and Holmes, {Mark J.} and Chan, {Christopher C.S.} and Reid, {Benjamin P.L.} and Alexander-Webber, {Jack A.} and Nicholas, {Robin J.} and Taylor, {Robert A.} and Kim, {Kwang S.} and Han, {Sang W.} and Woochul Yang and Y. Jo and J. Kim and Hyunsik Im",

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doi = "10.1021/acs.nanolett.5b00924",

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AU - Park, Young S.

AU - Lee, Geunsik

AU - Holmes, Mark J.

AU - Chan, Christopher C.S.

AU - Reid, Benjamin P.L.

AU - Alexander-Webber, Jack A.

AU - Nicholas, Robin J.

AU - Taylor, Robert A.

AU - Kim, Kwang S.

AU - Han, Sang W.

AU - Yang, Woochul

AU - Jo, Y.

AU - Kim, J.

AU - Im, Hyunsik

PY - 2015/7/8

Y1 - 2015/7/8

N2 - 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.

AB - 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.

KW - density functional theory

KW - nanotube

KW - photoluminescence

KW - self-assembling nanostructures

KW - semiconductor

KW - surface effects

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Surface-Effect-Induced Optical Bandgap Shrinkage in GaN Nanotubes

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Keywords

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