Evolution of defect formation during atomically precise desulfurization of monolayer MoS2

Title
Evolution of defect formation during atomically precise desulfurization of monolayer MoS2
Authors
손장엽이종영김종훈정연준신준철이양진김관표김남원Arend M. van der Zande이관형
Keywords
MoS2; Hydrogen plasma; Desulfurization; Defect
Issue Date
2021-07
Publisher
Communications Materials
Citation
VOL 2, NO 80-10
Abstract
Structural symmetry-breaking is a key strategy to modify the physical and chemical properties of two-dimensional transition metal dichalcogenides. However, little is known about defect formation during this process. Here, with atomic-scale microscopy, we investigate the evolution of defect formation in monolayer MoS2 exposed indirectly to hydrogen plasma. At the beginning of the treatment only top-layer sulfur atoms are removed, while vacancies and the molybdenum atomic layer are maintained. As processing continues, hexagonal-shaped nanocracks are generated along the zigzag edge during relaxation of defect-induced strain. As defect density increases, both photoluminescence and conductivity of MoS2 gradually decreases. Furthermore, MoS2 showed increased friction by 50% due to defect-induced contact stiffness. Our study reveals the details of defect formation during the desulfurization of MoS2 and helps to design the symmetry-breaking transition metal dichalcogenides, which is of relevance for applications including photocatalyst for water splitting, and Janus heterostructures.
URI
http://pubs.kist.re.kr/handle/201004/73488
ISSN
2662-4443
Appears in Collections:
KIST Publication > Article
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