Structural impact on the nanoscale optical properties of InGaN core-shell nanorods

J. T. Griffiths, C. X. Ren, P.-M. Coulon, E. D. Le Boulbar, C. G. Bryce, I. Girgel, A. Howkins, I. Boyd, R. W. Martin, D. W. E. Allsopp, P. A. Shields, C. J. Humphreys, R. A. Oliver

Research output: Contribution to journalLetter

9 Citations (Scopus)

Abstract

III-nitride core-shell nanorods are promising for the development of high efficiency light emitting diodes and novel optical devices. We reveal the nanoscale optical and structural properties of core-shell InGaN nanorods formed by combined top-down etching and regrowth to achieve non-polar sidewalls with a low density of extended defects. While the luminescence is uniform along the non-polar {1–100} sidewalls, nano-cathodoluminescence shows a sharp reduction in the luminescent intensity at the intersection of the non-polar {1–100} facets. The reduction in the luminescent intensity is accompanied by a reduction in the emission energy localised at the apex of the corners. Correlative compositional analysis reveals an increasing indium content towards the corner except at the apex itself. We propose that the observed variations in the structure and chemistry are responsible for the changes in the optical properties at the corners of the nanorods. The insights revealed by nano-cathodoluminescence will aid in the future development of higher efficiency core-shell nanorods.
LanguageEnglish
Article number172105
Number of pages5
JournalApplied Physics Letters
Volume110
DOIs
Publication statusPublished - 28 Apr 2017

Fingerprint

nanorods
optical properties
cathodoluminescence
luminous intensity
apexes
intersections
nitrides
indium
flat surfaces
light emitting diodes
etching
chemistry
luminescence
defects
energy

Keywords

  • nanorods
  • light emitting diodes
  • nano-cathodoluminescence
  • nitride semiconductors
  • quantum confined Stark effect
  • efficiency droop

Cite this

Griffiths, J. T., Ren, C. X., Coulon, P-M., Le Boulbar, E. D., Bryce, C. G., Girgel, I., ... Oliver, R. A. (2017). Structural impact on the nanoscale optical properties of InGaN core-shell nanorods. Applied Physics Letters, 110, [172105]. https://doi.org/10.1063/1.4982594
Griffiths, J. T. ; Ren, C. X. ; Coulon, P.-M. ; Le Boulbar, E. D. ; Bryce, C. G. ; Girgel, I. ; Howkins, A. ; Boyd, I. ; Martin, R. W. ; Allsopp, D. W. E. ; Shields, P. A. ; Humphreys, C. J. ; Oliver, R. A. / Structural impact on the nanoscale optical properties of InGaN core-shell nanorods. In: Applied Physics Letters. 2017 ; Vol. 110.
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abstract = "III-nitride core-shell nanorods are promising for the development of high efficiency light emitting diodes and novel optical devices. We reveal the nanoscale optical and structural properties of core-shell InGaN nanorods formed by combined top-down etching and regrowth to achieve non-polar sidewalls with a low density of extended defects. While the luminescence is uniform along the non-polar {1–100} sidewalls, nano-cathodoluminescence shows a sharp reduction in the luminescent intensity at the intersection of the non-polar {1–100} facets. The reduction in the luminescent intensity is accompanied by a reduction in the emission energy localised at the apex of the corners. Correlative compositional analysis reveals an increasing indium content towards the corner except at the apex itself. We propose that the observed variations in the structure and chemistry are responsible for the changes in the optical properties at the corners of the nanorods. The insights revealed by nano-cathodoluminescence will aid in the future development of higher efficiency core-shell nanorods.",
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author = "Griffiths, {J. T.} and Ren, {C. X.} and P.-M. Coulon and {Le Boulbar}, {E. D.} and Bryce, {C. G.} and I. Girgel and A. Howkins and I. Boyd and Martin, {R. W.} and Allsopp, {D. W. E.} and Shields, {P. A.} and Humphreys, {C. J.} and Oliver, {R. A.}",
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Griffiths, JT, Ren, CX, Coulon, P-M, Le Boulbar, ED, Bryce, CG, Girgel, I, Howkins, A, Boyd, I, Martin, RW, Allsopp, DWE, Shields, PA, Humphreys, CJ & Oliver, RA 2017, 'Structural impact on the nanoscale optical properties of InGaN core-shell nanorods' Applied Physics Letters, vol. 110, 172105. https://doi.org/10.1063/1.4982594

Structural impact on the nanoscale optical properties of InGaN core-shell nanorods. / Griffiths, J. T.; Ren, C. X.; Coulon, P.-M.; Le Boulbar, E. D.; Bryce, C. G.; Girgel, I.; Howkins, A.; Boyd, I.; Martin, R. W.; Allsopp, D. W. E.; Shields, P. A.; Humphreys, C. J.; Oliver, R. A.

In: Applied Physics Letters, Vol. 110, 172105, 28.04.2017.

Research output: Contribution to journalLetter

TY - JOUR

T1 - Structural impact on the nanoscale optical properties of InGaN core-shell nanorods

AU - Griffiths, J. T.

AU - Ren, C. X.

AU - Coulon, P.-M.

AU - Le Boulbar, E. D.

AU - Bryce, C. G.

AU - Girgel, I.

AU - Howkins, A.

AU - Boyd, I.

AU - Martin, R. W.

AU - Allsopp, D. W. E.

AU - Shields, P. A.

AU - Humphreys, C. J.

AU - Oliver, R. A.

PY - 2017/4/28

Y1 - 2017/4/28

N2 - III-nitride core-shell nanorods are promising for the development of high efficiency light emitting diodes and novel optical devices. We reveal the nanoscale optical and structural properties of core-shell InGaN nanorods formed by combined top-down etching and regrowth to achieve non-polar sidewalls with a low density of extended defects. While the luminescence is uniform along the non-polar {1–100} sidewalls, nano-cathodoluminescence shows a sharp reduction in the luminescent intensity at the intersection of the non-polar {1–100} facets. The reduction in the luminescent intensity is accompanied by a reduction in the emission energy localised at the apex of the corners. Correlative compositional analysis reveals an increasing indium content towards the corner except at the apex itself. We propose that the observed variations in the structure and chemistry are responsible for the changes in the optical properties at the corners of the nanorods. The insights revealed by nano-cathodoluminescence will aid in the future development of higher efficiency core-shell nanorods.

AB - III-nitride core-shell nanorods are promising for the development of high efficiency light emitting diodes and novel optical devices. We reveal the nanoscale optical and structural properties of core-shell InGaN nanorods formed by combined top-down etching and regrowth to achieve non-polar sidewalls with a low density of extended defects. While the luminescence is uniform along the non-polar {1–100} sidewalls, nano-cathodoluminescence shows a sharp reduction in the luminescent intensity at the intersection of the non-polar {1–100} facets. The reduction in the luminescent intensity is accompanied by a reduction in the emission energy localised at the apex of the corners. Correlative compositional analysis reveals an increasing indium content towards the corner except at the apex itself. We propose that the observed variations in the structure and chemistry are responsible for the changes in the optical properties at the corners of the nanorods. The insights revealed by nano-cathodoluminescence will aid in the future development of higher efficiency core-shell nanorods.

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KW - light emitting diodes

KW - nano-cathodoluminescence

KW - nitride semiconductors

KW - quantum confined Stark effect

KW - efficiency droop

U2 - 10.1063/1.4982594

DO - 10.1063/1.4982594

M3 - Letter

VL - 110

JO - Applied Physics Letters

T2 - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

M1 - 172105

ER -