Abstract
| Language | English |
|---|---|
| Article number | 172105 |
| Number of pages | 5 |
| Journal | Applied Physics Letters |
| Volume | 110 |
| DOIs | |
| Publication status | Published - 28 Apr 2017 |
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Keywords
- nanorods
- light emitting diodes
- nano-cathodoluminescence
- nitride semiconductors
- quantum confined Stark effect
- efficiency droop
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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 journal › Letter
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.
KW - nanorods
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 -