Misorientation‐Angle‐Dependent Phase Transformation in van der Waals Multilayers via Electron‐Beam Irradiation |
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| Authors: | Un Jeong Kim Hyangsook Lee Woojin Lee Hye Yun Jeong Hyun Kim Gang Hee Han Hyo Sug Lee Yeonsang Park Young‐Geun Roh Young Hee Lee Eunha Lee Sung Woo Hwang |
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| Affiliation: | 1. Imaging Device Lab., Samsung Advanced Institute of Technology, Suwon, Republic of Korea;2. AE Group, Platform Technology Laboratory, Samsung Advanced Institute of Technology, Suwon, Republic of Korea;3. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Republic of Korea;4. CAE Group, Platform Technology Laboratory, Samsung Advanced Institute of Technology, Suwon, Republic of Korea;5. Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Suwon, Republic of Korea;6. Department of Physics, Sungkyunkwan University, Suwon, Republic of Korea;7. Samsung Advanced Institute of Technology, Suwon, Republic of Korea |
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| Abstract: | Misorientation‐angle dependence on layer thickness is an intriguing feature of van der Waals materials, which causes stark optical gain and electrical transport modulation. However, the influence of misorientation angle on phase transformation is not determined yet. Herein, this phenomenon in a MoS2 multilayer via in situ electron‐beam irradiation is reported. An AA′‐stacked MoS2 bilayer undergoes structural transformation from the 2H semiconducting phase to the 1T′ metallic phase, similar to a MoS2 monolayer, which is confirmed via in situ transmission electron microscopy. Moreover, non‐AA′ stacking, which has no local AA′ stacking order in the Moiré pattern, does not reveal such a phase transformation. While a collective sliding motion of chalcogen atoms easily occurs during the transformation in AA′ stacking, in non‐AA′ stacking it is suppressed by the weak van der Waals strength and by the chalcogen atoms interlocked at different orientations, which disfavor their kinetics by the increased entropy of mixing. |
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| Keywords: | e‐beam irradiation misorientation angle MoS2 phase transformation van der Waals multilayers |
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