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Controllable 2H-to-1T’ phase transition in few-layer MoTe2


Most of two-dimensional (2D) transition metal dichalcogenides (TMDs) exhibit more than one structural phases, leading to a number of exotic physics and potential 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 work, which reveal the accumulated heating effect as the main driving force for such phase transition. By carefully adjusting the laser power and irradiation time, we were able to control the structural phases of MoTe2 as 2H, 2H + 1T’, and 1T’, respectively. After thermal annealing at rather low temperature, the laser irradiated MoTe2 shows 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 instantaneous local heating. Our finding together with the unique properties of MoTe2, paves a way for high performance nanoelectronics and optoelectronics based on 2D TMDs and their heterostructures.

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Publication details

The article was accepted on 02 Oct 2018 and first published on 10 Oct 2018

Article type: Paper
DOI: 10.1039/C8NR06115G
Citation: Nanoscale, 2018, Accepted Manuscript
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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, Accepted Manuscript , DOI: 10.1039/C8NR06115G

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