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Multiple 2D Phase Transformations in Monolayer Transition Metal Chalcogenides

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Title
Multiple 2D Phase Transformations in Monolayer Transition Metal Chalcogenides
Author(s)
Hong, Jinhua; Chen, Xi; Pai Li; Koshino, Masanori; Li, Shisheng; Xu, Hua; Hu, Zhixin; Feng Ding; Suenaga, Kazu
Publication Date
2022-05
Journal
Advanced Materials, v.34, no.19
Publisher
John Wiley and Sons Inc
Abstract
© 2022 Wiley-VCH GmbH.Phase transformation lies at the heart of materials science because it allows for the control of structural phases of solids with desired properties. It has long been a challenge to manipulate phase transformations in crystals at the nanoscale with designed interfaces and compositions. Here in situ electron microscopy is employed to fabricate novel 2D phases with different stoichiometries in monolayer MoS2 and MoSe2. The multiphase transformations: MoS2 → Mo4S6 and MoSe2 → Mo6Se6 which are highly localized with atomically sharp boundaries are observed. Their atomic mechanisms are determined as chalcogen 2H ↔ 1T sliding, cation shift, and commensurate lattice reconstructions, resulting in decreasing direct bandgaps and even a semiconductor–metal transition. These results will be a paradigm for the manipulation of multiphase heterostructures with controlled compositions and sharp interfaces, which will guide the future phase engineered electronics and optoelectronics of metal chalcogenides.
URI
https://pr.ibs.re.kr/handle/8788114/11412
DOI
10.1002/adma.202200643
ISSN
0935-9648
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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