dc.contributor.author Kundys, D dc.contributor.author Sutherland, D dc.contributor.author Davies, MJ dc.contributor.author Oehler, F dc.contributor.author Griffiths, J dc.contributor.author Dawson, P dc.contributor.author Kappers, MJ dc.contributor.author Humphreys, CJ dc.contributor.author Schulz, S dc.contributor.author Tang, F dc.contributor.author Oliver, RA dc.date.accessioned 2016-12-05T16:48:08Z dc.date.available 2016-12-05T16:48:08Z dc.date.issued 2016-11 dc.identifier.issn 1468-6996 dc.identifier.uri https://www.repository.cam.ac.uk/handle/1810/261445 dc.description.abstract We report on a comparative study of the low temperature emission and polarisation properties of InGaN/GaN quantum wells grown on nonpolar (11$\bar 2$0) $\textit{a}$-plane and (10$\bar 1$0) m-plane free-standing bulk GaN substrates where the In content varied from 0.14 to 0.28 in the m-plane series and 0.08 to 0.21 for the a-plane series. The low temperature photoluminescence spectra from both sets of samples are broad with full width at half maximum height increasing from 81 to 330 meV as the In fraction increases. Photoluminescence excitation spectroscopy indicates that the recombination mainly involves strongly localised carriers. At 10 K the degree of linear polarisation of the $\textit{a}$-plane samples is much smaller than of the $\textit{m}$-plane counterparts and also varies across the spectrum. From polarisation-resolved photoluminescence excitation spectroscopy we measured the energy splitting between the lowest valence sub-bands to lie in the range of 23–54 meV for the $\textit{a}$- and $\textit{m}$-plane samples in which we could observe distinct exciton features. Thus the thermal occupation of a higher valence sub-band cannot be responsible for the reduction of the degree of linear polarisation at 10 K. Time-resolved spectroscopy indicates that in $\textit{a}$-plane samples there is an extra emission component which is at least partly responsible for the reduction in the degree of linear polarisation. dc.description.sponsorship This work was supported by UK Engineering and Physical Sciences Research Council [grant numbers EP\J001627\1, EP\J003603\1]; and Science Foundation Ireland [grant number 13/SIRG/2210]. dc.language ENG dc.language.iso en dc.publisher Institute of Physics dc.rights Attribution 4.0 International dc.rights Attribution 4.0 International dc.rights Attribution 4.0 International dc.rights Attribution 4.0 International dc.rights.uri http://creativecommons.org/licenses/by/4.0/ dc.rights.uri http://creativecommons.org/licenses/by/4.0/ dc.rights.uri http://creativecommons.org/licenses/by/4.0/ dc.rights.uri http://creativecommons.org/licenses/by/4.0/ dc.subject InGaN dc.subject quantum wells dc.subject polarised light dc.subject non-polar dc.title A study of the optical and polarisation properties of InGaN/GaN multiple quantum wells grown on $\textit{a}$-plane and $\textit{m}$-plane GaN substrates dc.type Article prism.endingPage 743 prism.issueIdentifier 1 prism.publicationDate 2016 prism.publicationName Science and Technology of Advanced Materials prism.startingPage 736 prism.volume 17 dc.identifier.doi 10.17863/CAM.6633 dcterms.dateAccepted 2016-09-30 rioxxterms.versionofrecord 10.1080/14686996.2016.1244474 rioxxterms.version VoR rioxxterms.licenseref.uri http://creativecommons.org/licenses/by/4.0/ rioxxterms.licenseref.startdate 2016-11 dc.contributor.orcid Griffiths, James [0000-0002-1198-1372] dc.contributor.orcid Humphreys, Colin [0000-0001-5053-3380] dc.contributor.orcid Oliver, Rachel [0000-0003-0029-3993] dc.identifier.eissn 1878-5514 dc.publisher.url http://dx.doi.org/10.1080/14686996.2016.1244474 rioxxterms.type Journal Article/Review pubs.funder-project-id European Research Council (279361) pubs.funder-project-id Engineering and Physical Sciences Research Council (EP/E035167/1) pubs.funder-project-id Engineering and Physical Sciences Research Council (EP/H019324/1) pubs.funder-project-id Engineering and Physical Sciences Research Council (EP/I012591/1) pubs.funder-project-id Engineering and Physical Sciences Research Council (EP/M010589/1) pubs.funder-project-id Engineering and Physical Sciences Research Council (TS/G001383/1) cam.issuedOnline 2016-11-10 cam.orpheus.success Thu Jan 30 12:56:52 GMT 2020 - The item has an open VoR version. rioxxterms.freetoread.startdate 2100-01-01
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