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Point Defects in InGaN/GaN Core-Shell Nanorods: Role of the Regrowth Interface

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cam.issuedOnline2021-03-08
dc.contributor.authorLoeto, K
dc.contributor.authorKusch, G
dc.contributor.authorCoulon, PM
dc.contributor.authorFairclough, SM
dc.contributor.authorBoulbar, EL
dc.contributor.authorGirgel, I
dc.contributor.authorShields, PA
dc.contributor.authorOliver, RA
dc.contributor.orcidLoeto, K [0000-0002-1694-2102]
dc.contributor.orcidKusch, G [0000-0003-2743-1022]
dc.contributor.orcidFairclough, SM [0000-0003-3781-8212]
dc.date.accessioned2022-01-10T12:50:19Z
dc.date.available2022-01-10T12:50:19Z
dc.date.issued2021
dc.date.submitted2020-12-13
dc.date.updated2022-01-10T12:50:19Z
dc.description.abstract<jats:title>Abstract</jats:title> <jats:p>Core-shell nanorod based light-emitting diodes (LEDs) with their exposed non-polar surfaces have the potential to overcome the limitations of planar LEDs by circumventing the quantum confined stark effect. In this experiment, InGaN/GaN core-shell nanorods were fabricated by a combination of top-down etching and bottom-up regrowth using metal-organic vapour phase epitaxy. When viewing the nanorods along their long axis, monochromatic cathodoluminescence maps taken at the GaN near-band-edge emission energy (3.39 eV) reveal a ring-like region of lower emission intensity. The diameter of this ring is found to be 530 (±20)nm corresponding to the ∼510 nm diameter nickel etch masks used to produce the initial GaN nanopillars. Thus, the dark ring corresponds to the regrowth interface. To understand the origin of the ring, scanning transmission electron microscopy (STEM) and cathodoluminescence (CL) hyperspectral mapping at 10K were performed. STEM imaging reveals the absence of extended defects in the nanorods and indeed near the regrowth interface. Monochromatic CL maps recorded at 10K show that the ring remains dark for monochromatic maps taken at the GaN near-band-edge emission energy (3.47 eV) but is bright when considering the donor-acceptor pair emission energy (3.27 eV). This peculiar anticorrelation indicates that the dark ring originates from an agglomeration of point defects associated with donor-acceptor pair emission. The point defects are incorporated and buried at the GaN regrowth interface from the chemical and/or physical damage induced by etching and lower the radiative recombination rate; limiting the radiative efficiency close to the regrowth interface.</jats:p>
dc.identifier.doi10.17863/CAM.79995
dc.identifier.eissn2632-959X
dc.identifier.issn2632-959X
dc.identifier.othernanoxabe990
dc.identifier.otherabe990
dc.identifier.othernanox-100380.r1
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/332545
dc.languageen
dc.language.isoeng
dc.publisherIOP Publishing
dc.publisher.urlhttp://dx.doi.org/10.1088/2632-959x/abe990
dc.subjectcathodoluminescence
dc.subjectpoint defects
dc.subjectcore-shell nanorods
dc.subjectnon-radiative recombination centres
dc.subjecthyperspectral mapping
dc.titlePoint Defects in InGaN/GaN Core-Shell Nanorods: Role of the Regrowth Interface
dc.typeArticle
dcterms.dateAccepted2021-02-24
prism.issueIdentifier1
prism.publicationNameNano Express
prism.volume2
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/R025193/1)
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/M010589/1)
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
rioxxterms.versionVoR
rioxxterms.versionofrecord10.1088/2632-959X/abe990

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