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나노 구조 물리 연구단
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Probing Multiphased Transition in Bulk MoS2 by Direct Electron Injection

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Title
Probing Multiphased Transition in Bulk MoS2 by Direct Electron Injection
Author(s)
Krishna P. Dhakal; Ganesh Ghimire; Kyungwha Chung; Dinh Loc Duong; Sung Wng Kim; Jeongyong Kim
Publication Date
2019-12
Journal
ACS NANO, v.13, no.12, pp.14437 - 14446
Publisher
AMER CHEMICAL SOC
Abstract
© 2019 American Chemical Society.Structural phase transitions in layered two-dimensional (2D) materials are of significant interest owing to their ability to exist in multiple metastable states with distinctive properties. However, phase transition in bulk MoS2 by nondestructive electron infusion has not yet been realized. In this study, we report the 2H to 1T′ phase transition and in-between intermediates in bulk MoS2 using MoS2/[Ca2N]+·e- heterostructures, in which kinetic free electrons were directly injected into MoS2. We observed various phases in MoS2 ranging from heavily doped 2H to a distorted lattice state and then on to a complete 1T′ state. Snapshots of the multiphase transition were captured by extraordinary Raman shift and bandgap reduction and were further elucidated by theoretical calculations. We also observed a weakening in interlayer coupling in the vicinity of the metallic regime, which led to an unusually strong photoluminescence emission, suggesting light-efficient bulk MoS2. Our results thus suggest the optoelectronic applications that can fully utilize the multiphase transition of bulk 2D materials
URI
https://pr.ibs.re.kr/handle/8788114/6747
ISSN
1936-0851
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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