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Article: Niobium doping induced mirror twin boundaries in MBE grown WSe2 monolayers

TitleNiobium doping induced mirror twin boundaries in MBE grown WSe2 monolayers
Authors
Keywordsmirror twin boundaries
niobium doping
molecular beam epitaxy
transition metal dichalcogenides
niobium
Issue Date2020
PublisherTsinghua University Press, co-published with Springer Verlag. The Journal's web site is located at http://www.springer.com/materials/nanotechnology/journal/12274
Citation
Nano Research, 2020, v. 13 n. 7, p. 1889-1896 How to Cite?
AbstractMirror twin boundary (MTB) brings unique one-dimensional (1D) physics and properties into two-dimensional (2D) transition metal dichalcogenides (TMDCs), but they were rarely observed in non-Mo-based TMDCs. Herein, by post-growth Nb doping, high density 4|4E-W and 4|4P-Se mirror twin boundaries (MTBs) were introduced into molecular beam epitaxy (MBE) grown WSe2 monolayers. Of them, 4|4E-W MTB with a novel structure was discovered experimentally for the first time, while 4|4P-Se MTBs present a random permutations of W and Nb, forming a 1D alloy system. Comparison between the doped and non-doped WSe2 confirmed that Nb dopants are essential for MTB formation. Furthermore, quantitative statistics reveal the areal density of MTBs is directly proportional to the concentration of Nb dopants. To unravel the injection pathway of Nb dopants, first-principles calculations about a set of formation energies for excess Nb atoms with different configurations were conducted, based on which a model explaining the origin of MTBs introduced by excess metal was built. We conclude that the formation of MTBs is mainly driven by the collective evolution of excess Nb atoms introduced into the lattice of host WSe2 crystal and subsequent displacement of metal atoms (W or Nb). This study provides a novel way to tailor the MTBs in 2D TMDC materials via proper metal doping and presents new opportunities for exploring the intriguing properties.
Persistent Identifierhttp://hdl.handle.net/10722/287296
ISSN
2020 Impact Factor: 8.897
2020 SCImago Journal Rankings: 2.536
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, B-
dc.contributor.authorXia, Y-
dc.contributor.authorZhang, J-
dc.contributor.authorKomsa, HP-
dc.contributor.authorXie, M-
dc.contributor.authorPeng, Y-
dc.contributor.authorJin, C-
dc.date.accessioned2020-09-22T02:58:50Z-
dc.date.available2020-09-22T02:58:50Z-
dc.date.issued2020-
dc.identifier.citationNano Research, 2020, v. 13 n. 7, p. 1889-1896-
dc.identifier.issn1998-0124-
dc.identifier.urihttp://hdl.handle.net/10722/287296-
dc.description.abstractMirror twin boundary (MTB) brings unique one-dimensional (1D) physics and properties into two-dimensional (2D) transition metal dichalcogenides (TMDCs), but they were rarely observed in non-Mo-based TMDCs. Herein, by post-growth Nb doping, high density 4|4E-W and 4|4P-Se mirror twin boundaries (MTBs) were introduced into molecular beam epitaxy (MBE) grown WSe2 monolayers. Of them, 4|4E-W MTB with a novel structure was discovered experimentally for the first time, while 4|4P-Se MTBs present a random permutations of W and Nb, forming a 1D alloy system. Comparison between the doped and non-doped WSe2 confirmed that Nb dopants are essential for MTB formation. Furthermore, quantitative statistics reveal the areal density of MTBs is directly proportional to the concentration of Nb dopants. To unravel the injection pathway of Nb dopants, first-principles calculations about a set of formation energies for excess Nb atoms with different configurations were conducted, based on which a model explaining the origin of MTBs introduced by excess metal was built. We conclude that the formation of MTBs is mainly driven by the collective evolution of excess Nb atoms introduced into the lattice of host WSe2 crystal and subsequent displacement of metal atoms (W or Nb). This study provides a novel way to tailor the MTBs in 2D TMDC materials via proper metal doping and presents new opportunities for exploring the intriguing properties.-
dc.languageeng-
dc.publisherTsinghua University Press, co-published with Springer Verlag. The Journal's web site is located at http://www.springer.com/materials/nanotechnology/journal/12274-
dc.relation.ispartofNano Research-
dc.rightsThis is a post-peer-review, pre-copyedit version of an article published in [insert journal title]. The final authenticated version is available online at: https://doi.org/[insert DOI]-
dc.subjectmirror twin boundaries-
dc.subjectniobium doping-
dc.subjectmolecular beam epitaxy-
dc.subjecttransition metal dichalcogenides-
dc.subjectniobium-
dc.titleNiobium doping induced mirror twin boundaries in MBE grown WSe2 monolayers-
dc.typeArticle-
dc.identifier.emailXia, Y: xiayp@hku.hk-
dc.identifier.emailZhang, J: jqzhang1@hku.hk-
dc.identifier.emailXie, M: mhxie@hku.hk-
dc.identifier.authorityXie, M=rp00818-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s12274-020-2639-6-
dc.identifier.scopuseid_2-s2.0-85080133409-
dc.identifier.hkuros314479-
dc.identifier.volume13-
dc.identifier.issue7-
dc.identifier.spage1889-
dc.identifier.epage1896-
dc.identifier.isiWOS:000516795000003-
dc.publisher.placeChina-
dc.identifier.issnl1998-0000-

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