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Kwak, Sang Kyu
Kyu’s MolSim Lab @ UNIST
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Antiphase Boundaries as Faceted Metallic Wires in 2D Transition Metal Dichalcogenides

Author(s)
Kim, Jung HwaKim, Se-YangPark, Sung O.Jung, Gwan YeongSong, SeungukSohn, AhrumKim, Sang-WooKwak, Sang KyuKwon, Soon-YongLee, Zonghoon
Issued Date
2020-08
DOI
10.1002/advs.202000788
URI
https://scholarworks.unist.ac.kr/handle/201301/33002
Fulltext
https://onlinelibrary.wiley.com/doi/full/10.1002/advs.202000788
Citation
ADVANCED SCIENCE, v.7, no.15, pp.2000788
Abstract
Antiphase boundaries (APBs) in 2D transition metal dichalcogenides have attracted wide interest as 1D metallic wires embedded in a semiconducting matrix, which could be exploited in fully 2D-integrated circuits. Here, the anisotropic morphologies of APBs (i.e., linear and saw-toothed APBs) in the nanoscale are investigated. The experimental and computational results show that despite their anisotropic nanoscale morphologies, all APBs adopt a predominantly chalcogen-oriented dense structure to maintain the energetically most stable atomic configuration. Moreover, the effect of the nanoscale morphology of an APB on electron transport from two-probe field effect transistor measurements is investigated. A saw-toothed APB has a considerably lower electron mobility than a linear APB, indicating that kinks between facets are the main factors of scattering. The observations contribute to the systematical understanding of the faceted APBs and its impact on electrical transport behavior and it could potentially extend the applications of 2D materials through defect engineering to achieve the desired properties.
Publisher
WILEY
ISSN
2198-3844
Keyword (Author)
anisotropyantiphase boundaryfaceted line defectsin-plane mobilityWS2graphene heterostructures
Keyword
GRAIN-BOUNDARIESDEFECTSMOS2

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