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Superluminescence and macroscopic exciton propagation in freestanding ZnO thin films

2020-11Journal article Restricted access
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dc.contributor.authorKhmelinskii, Igor
dc.contributor.authorMakarov, Vladimir, I
dc.date.accessioned2021-06-24T11:35:09Z
dc.date.available2021-06-24T11:35:09Z
dc.date.issued2020-11
dc.description.abstractRecently we have reported properties of ZnO semiconductor films attached to CaF2 substrate. Presently we characterized absorption, emission and superluminescence of freestanding ZnO films, comparing these to the attached films with the same thickness values. The absorption spectra of the freestanding films had resolved bands, with the band density increasing with the nanofilm thickness. Additionally, the spectral transitions in these films were blue-shifted as compared to attached films. The absorption and emission spectra of freestanding films were resolved better than those of attached films, with the difference traceable to the surface roughness of the substrate used for deposition. We also explored exciton dynamics and propagation over macroscopic distances in freestanding films. The excitons lived longer and propagated further in freestanding films as compared to attached films. The superluminescence yield in freestanding 9.3 nm film of 0.43 +/- 0.05 was significantly larger than 0.17 +/- 0.03 in an equivalent attached film. We provided a detailed analysis of the results obtained. The reported data are unique, demonstrating significant difference in the optical properties of attached and freestanding ZnO thin films. Freestanding ZnO films are promising for optoelectmnic applications.
dc.description.sponsorshipPR NASA EPSCoR (NASA)National Aeronautics & Space Administration (NASA) [80NSSC19M0049]
dc.description.sponsorshipPR Space Grant (NASA) [NNX15AI11H]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.jpcs.2020.109568
dc.identifier.issn0022-3697
dc.identifier.urihttp://hdl.handle.net/10400.1/16355
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.subjectThin film
dc.subjectZnO
dc.subjectOptical absorption
dc.subjectEmission
dc.subjectFreestanding thin film
dc.subjectSuperluminescence
dc.subject.otherChemistry
dc.titleSuperluminescence and macroscopic exciton propagation in freestanding ZnO thin films
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage109568
oaire.citation.titleJournal of Physics and Chemistry of Solids
oaire.citation.volume146
person.familyNameKhmelinskii
person.givenNameIgor
person.identifier0000000420541031
person.identifier.ciencia-id0D1A-CB6C-6316
person.identifier.orcid0000-0002-6116-184X
person.identifier.ridC-9587-2011
person.identifier.scopus-author-id6701444934
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublicationfcb9f09f-2e99-41fb-8c08-7e1acbc65076
relation.isAuthorOfPublication.latestForDiscoveryfcb9f09f-2e99-41fb-8c08-7e1acbc65076

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