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Issue 42, 2018
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Controllable 2H-to-1T′ phase transition in few-layer MoTe2

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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.

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

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The article was received on 30 Jul 2018, accepted on 02 Oct 2018 and first published on 10 Oct 2018

Article type: Paper
DOI: 10.1039/C8NR06115G
Citation: Nanoscale, 2018,10, 19964-19971

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

    Y. Tan, F. Luo, M. Zhu, X. Xu, Y. Ye, B. Li, G. Wang, W. Luo, X. Zheng, N. Wu, Y. Yu, S. Qin and X. Zhang, Nanoscale, 2018, 10, 19964
    DOI: 10.1039/C8NR06115G

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