Structural impact on the nanoscale optical properties of InGaN core-shell nanorods
Structural impact on the nanoscale optical properties of InGaN core-shell nanorods
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DOI：
10.1063/1.4982594
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发表时间：
2017-04-24
影响因子：
4
通讯作者：
Oliver, R. A.
中科院分区：
文献类型：
--
作者：
Griffiths, J. T.;Ren, C. X.;Oliver, R. A.
III-氮化物核-壳纳米棒在开发高效发光二极管和新型光学器件方面具有广阔的应用前景。我们揭示了核壳结构InGaN纳米棒的纳米尺度、光学和结构特性，这种纳米棒是通过自顶向下的腐蚀和再生长相结合形成的，从而获得了具有低扩展缺陷密度的非极性侧壁。当发光沿非极性的{1-100}面均匀时，纳米阴极发光在非极性的{1-100}面的交叉处的发光强度急剧降低。发光强度的降低伴随着位于拐角尖端的发射能量的降低。相关成分分析表明，除峰顶本身外，铟的含量向拐角方向逐渐增加。我们认为，我们观察到的结构和化学变化是导致纳米棒拐角光学性质变化的原因。纳米阴极发光所揭示的洞察力将有助于未来开发更高效的核壳纳米棒。由AIP出版公司出版。
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. Published by AIP Publishing.