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Article: Oxygen Passivation Mediated Tunability of Trion and Excitons in MoS2

TitleOxygen Passivation Mediated Tunability of Trion and Excitons in MoS2
Authors
Issue Date2017
Citation
Physical Review Letters, 2017, v. 119, n. 7, article no. 077402 How to Cite?
AbstractUsing wide spectral range in situ spectroscopic ellipsometry with systematic ultrahigh vacuum annealing and in situ exposure to oxygen, we report the complex dielectric function of MoS2 isolating the environmental effects and revealing the crucial role of unpassivated and passivated sulphur vacancies. The spectral weights of the A (1.92 eV) and B (2.02 eV) exciton peaks in the dielectric function reduce significantly upon annealing, accompanied by spectral weight transfer in a broad energy range. Interestingly, the original spectral weights are recovered upon controlled oxygen exposure. This tunability of the excitonic effects is likely due to passivation and reemergence of the gap states in the band structure during oxygen adsorption and desorption, respectively, as indicated by ab initio density functional theory calculation results. This Letter unravels and emphasizes the important role of adsorbed oxygen in the optical spectra and many-body interactions of MoS2.
Persistent Identifierhttp://hdl.handle.net/10722/298225
ISSN
2023 Impact Factor: 8.1
2023 SCImago Journal Rankings: 3.040
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DC FieldValueLanguage
dc.contributor.authorGogoi, Pranjal Kumar-
dc.contributor.authorHu, Zhenliang-
dc.contributor.authorWang, Qixing-
dc.contributor.authorCarvalho, Alexandra-
dc.contributor.authorSchmidt, Daniel-
dc.contributor.authorYin, Xinmao-
dc.contributor.authorChang, Yung Huang-
dc.contributor.authorLi, Lain Jong-
dc.contributor.authorSow, Chorng Haur-
dc.contributor.authorNeto, A. H.Castro-
dc.contributor.authorBreese, Mark B.H.-
dc.contributor.authorRusydi, Andrivo-
dc.contributor.authorWee, Andrew T.S.-
dc.date.accessioned2021-04-08T03:07:56Z-
dc.date.available2021-04-08T03:07:56Z-
dc.date.issued2017-
dc.identifier.citationPhysical Review Letters, 2017, v. 119, n. 7, article no. 077402-
dc.identifier.issn0031-9007-
dc.identifier.urihttp://hdl.handle.net/10722/298225-
dc.description.abstractUsing wide spectral range in situ spectroscopic ellipsometry with systematic ultrahigh vacuum annealing and in situ exposure to oxygen, we report the complex dielectric function of MoS2 isolating the environmental effects and revealing the crucial role of unpassivated and passivated sulphur vacancies. The spectral weights of the A (1.92 eV) and B (2.02 eV) exciton peaks in the dielectric function reduce significantly upon annealing, accompanied by spectral weight transfer in a broad energy range. Interestingly, the original spectral weights are recovered upon controlled oxygen exposure. This tunability of the excitonic effects is likely due to passivation and reemergence of the gap states in the band structure during oxygen adsorption and desorption, respectively, as indicated by ab initio density functional theory calculation results. This Letter unravels and emphasizes the important role of adsorbed oxygen in the optical spectra and many-body interactions of MoS2.-
dc.languageeng-
dc.relation.ispartofPhysical Review Letters-
dc.titleOxygen Passivation Mediated Tunability of Trion and Excitons in MoS2-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1103/PhysRevLett.119.077402-
dc.identifier.pmid28949667-
dc.identifier.scopuseid_2-s2.0-85028358828-
dc.identifier.volume119-
dc.identifier.issue7-
dc.identifier.spagearticle no. 077402-
dc.identifier.epagearticle no. 077402-
dc.identifier.eissn1079-7114-
dc.identifier.isiWOS:000407719400012-
dc.identifier.issnl0031-9007-

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