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Author

Kwon, Soon-Yong
Frontier, Innovative Nanomaterials & Devices (FIND) Lab
Research Interests
  • Semiconductor Epitaxy, thin film technology & surface/ interface Science

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Substantial improvements of long-term stability in encapsulation-free WS2 using highly interacting graphene substrate

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Title
Substantial improvements of long-term stability in encapsulation-free WS2 using highly interacting graphene substrate
Author
Kim, Se-YangKwak, JinsungKim, Jung HwaLee, Jae-UngJo, YongsuKim, Sung YoubCheong HyeonsikLee, ZonghoonKwon, Soon-Yong
Keywords
transition metal dichalcogenides (TMDs); graphene; air stability; crystallinity; interlayer coupling; WS2/graphene heterostructure
Issue Date
201703
Publisher
IOP PUBLISHING LTD
Citation
2D MATERIALS, v.4, no., pp.011007 -
Abstract
We report the novel role of graphene substrates in obstructing the aging propagation in both the basal planes and edges of two-dimensitional sheets of transition metal dichalcogenides (TMDs). Even after 300 d in ambient air conditions, the epitaxially grown WS2/graphene samples have a clean, uniform surface without any encapsulation. We show that high crystallinity is an effective factor that determines the excellent air stability of WS2/graphene, and we present impressive experimental evidence of the relation between defects and the aging phenomena. Moreover, we reveal the strong interlayer charge interaction as an additional factor for the enhanced air stability as a result of charge transfer-induced doping. This work not only proposes a simple method to create highly stable TMDs by the selection of a suitable substrate but also paves the way for the realization of practical TMDs-based applications.
URI
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DOI
http://dx.doi.org/10.1088/2053-1583/4/1/011007
ISSN
2053-1583
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