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Article: Suppression of Surface Defects and Vibrational Coupling in GaN by a Graphene Monolayer

TitleSuppression of Surface Defects and Vibrational Coupling in GaN by a Graphene Monolayer
Authors
Issue Date2022
PublisherWiley-V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1862-6270
Citation
Physica Status Solidi - Rapid Research Letters, 2022, v. 16 n. 2, p. article no. 2100489 How to Cite?
AbstractThe optical transitions and random walking dynamics of the three types of excitons, namely, free, donor-bound, and acceptor-like surface-defect-bound excitons, in both the graphene−GaN hybrid structure and bare GaN are comparatively examined using variable-temperature steady-state photoluminescence and time-resolved photoluminescence. The results reveal that the effective suppression of surface defects may be realized by a graphene capping monolayer, evidenced by the strong reduction of the luminescence signal of the surface-defect-bound excitons and the simultaneous enhancement of the free exciton luminescence. More interestingly, the coupling strengths between all the three kinds of excitons and the longitudinal optical phonons tend to weaken, especially for the surface-defect-bound excitons, which exhibit a reduction of ≈40%. These findings indicate that capping GaN by graphene could be an effective way to passivate harmful surface defects and address the heating problem in GaN-based devices.
Persistent Identifierhttp://hdl.handle.net/10722/309860
ISSN
2023 Impact Factor: 2.5
2023 SCImago Journal Rankings: 0.655
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZheng, C-
dc.contributor.authorNing, J-
dc.contributor.authorYe, H-
dc.contributor.authorZhang, L-
dc.contributor.authorXu, K-
dc.contributor.authorZhao, D-
dc.contributor.authorNi, Z-
dc.contributor.authorWang, J-
dc.contributor.authorXu, S-
dc.date.accessioned2022-01-10T09:14:52Z-
dc.date.available2022-01-10T09:14:52Z-
dc.date.issued2022-
dc.identifier.citationPhysica Status Solidi - Rapid Research Letters, 2022, v. 16 n. 2, p. article no. 2100489-
dc.identifier.issn1862-6254-
dc.identifier.urihttp://hdl.handle.net/10722/309860-
dc.description.abstractThe optical transitions and random walking dynamics of the three types of excitons, namely, free, donor-bound, and acceptor-like surface-defect-bound excitons, in both the graphene−GaN hybrid structure and bare GaN are comparatively examined using variable-temperature steady-state photoluminescence and time-resolved photoluminescence. The results reveal that the effective suppression of surface defects may be realized by a graphene capping monolayer, evidenced by the strong reduction of the luminescence signal of the surface-defect-bound excitons and the simultaneous enhancement of the free exciton luminescence. More interestingly, the coupling strengths between all the three kinds of excitons and the longitudinal optical phonons tend to weaken, especially for the surface-defect-bound excitons, which exhibit a reduction of ≈40%. These findings indicate that capping GaN by graphene could be an effective way to passivate harmful surface defects and address the heating problem in GaN-based devices.-
dc.languageeng-
dc.publisherWiley-V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1862-6270-
dc.relation.ispartofPhysica Status Solidi - Rapid Research Letters-
dc.titleSuppression of Surface Defects and Vibrational Coupling in GaN by a Graphene Monolayer-
dc.typeArticle-
dc.identifier.emailXu, S: sjxu@hku.hk-
dc.identifier.authorityXu, S=rp00821-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/pssr.202100489-
dc.identifier.scopuseid_2-s2.0-85121380459-
dc.identifier.hkuros331363-
dc.identifier.volume16-
dc.identifier.issue2-
dc.identifier.spagearticle no. 2100489-
dc.identifier.epagearticle no. 2100489-
dc.identifier.isiWOS:000730654500001-
dc.publisher.placeGermany-

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