Controllable 2H-to-1T′ phase transition in few-layer MoTe2

Yuan Tan, Fang Luo, Mengjian Zhu*, Xiaolong Xu, Yu Ye, Bing Li, Guang Wang, Wei Luo, Xiaoming Zheng, Nannan Wu, Yayun Yu, Shiqiao Qin, Xue Ao Zhang

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

112 引用 (Scopus)

摘要

Most two-dimensional (2D) transition metal dichalcogenides (TMDs) exhibit more than one structural phase, leading to a number of remarkable physics and potential device applications beyond graphene. Here, we demonstrated a feasible route to trigger 2H-to-1T′ phase transition in few-layer molybdenum ditelluride (MoTe2) by laser irradiation. The effects of laser power and irradiation duration were systematically studied in this study, revealing the accumulated heating effect as the main driving force for such a phase transition. By carefully adjusting laser power and irradiation time, we could control the structural phases of MoTe2 as 2H, 2H + 1T′, and 1T′. After thermal annealing at a rather low temperature, the laser-irradiated MoTe2 showed a completely suppressed 2H component and a more stabilized 1T′ phase, demonstrating that the microscopic origin of the irreversible 2H-to-1T′ phase transition is the formation of Te vacancies in MoTe2 due to laser local instantaneous heating. Our findings together with the unique properties of MoTe2 pave the way for high-performance nanoelectronics and optoelectronics based on 2D TMDs and their heterostructures.

源语言英语
页(从-至)19964-19971
页数8
期刊Nanoscale
10
42
DOI
出版状态已出版 - 14 11月 2018
已对外发布

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