Site controlled Red-Yellow-Green light emitting InGaN Quantum Discs on nano-tipped GaN rods
Type
ArticleAuthors
Conroy, Michele AnnLi, Haoning
Kusch, Gunnar

Zhao, Chao

Ooi, Boon S.

Paul, Edwards
Martin, Robert W.

Holmes, Justin D.
Parbrook, Peter
KAUST Department
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) DivisionElectrical Engineering Program
Photonics Laboratory
Physical Characterization
Date
2016Permanent link to this record
http://hdl.handle.net/10754/601362
Metadata
Show full item recordAbstract
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 NanoscaleSponsors
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
NanoscaleAdditional Links
http://pubs.rsc.org/en/Content/ArticleLanding/2016/NR/C6NR00116Eae974a485f413a2113503eed53cd6c53
10.1039/C6NR00116E