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    Site controlled Red-Yellow-Green light emitting InGaN Quantum Discs on nano-tipped GaN rods

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    Type
    Article
    Authors
    Conroy, Michele Ann
    Li, Haoning
    Kusch, Gunnar cc
    Zhao, Chao cc
    Ooi, Boon S. cc
    Paul, Edwards
    Martin, Robert W. cc
    Holmes, Justin D.
    Parbrook, Peter
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Photonics Laboratory
    Physical Characterization
    Date
    2016
    Permanent link to this record
    http://hdl.handle.net/10754/601362
    
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    Abstract
    We report a method of growing site controlled InGaN multiple quantum discs (QDs) at uniform wafer scale on coalescence free ultra-high density (>80%) nanorod templates by metal organic chemical vapour deposition (MOCVD). The dislocation and coalescence free nature of the GaN space filling nanorod arrays eliminates the well-known emission problems seen in InGaN based visible light sources that these types of crystallographic defects cause. Correlative scanning transmission electron microscopy (STEM), energy-dispersive x-ray (EDX) mapping and cathodoluminescence (CL) hyperspectral imaging illustrates the controlled site selection of the red, yellow and green (RYG) emission at these nano tips. This article reveals that the nanorod tips’ broad emission in the RYG visible range is in fact achieved by manipulating the InGaN QD’s confinement dimensions, rather than significantly increasing the In%. This article details the easily controlled method of manipulating the QDs dimensions producing high crystal quality InGaN without complicated growth conditions needed for strain relaxation and alloy compositional changes seen for bulk planar GaN templates.
    Citation
    Site controlled Red-Yellow-Green light emitting InGaN Quantum Discs on nano-tipped GaN rods 2016 Nanoscale
    Sponsors
    This research was enabled by the Irish Higher Education Authority Programme for Research in Third Level Institutions Cycles 4 and 5 via the INSPIRE and TYFFANI projects, and by Science Foundation Ireland (SFI) under Grant no. SFI/10/IN.1/I2993. PJP acknowledges funding from SFI Engineering Professorship scheme (07/EN/E001A) and MC acknowledges PhD research scholarship from INSPIRE. This work was conducted under the framework of the Irish Government's Programme for Research in Third Level Institutions Cycle 5, National Development Plan 2007–2013 with the assistance of the European Regional Development Fund. RWM and GK acknowledge funding from the Engineering and Physical Sciences Research Council (EPSRC) (EP/M003132/1) of the UK. We also acknowledge the support of Duc V. Dinh for his help with the PL spectra and William Jagoe for his illustrations in the article.
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    Nanoscale
    DOI
    10.1039/C6NR00116E
    Additional Links
    http://pubs.rsc.org/en/Content/ArticleLanding/2016/NR/C6NR00116E
    ae974a485f413a2113503eed53cd6c53
    10.1039/C6NR00116E
    Scopus Count
    Collections
    Articles; Electrical and Computer Engineering Program; Photonics Laboratory; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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