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Controllable 2H-to-1T' phase transition in few-layer MoTe2.
Nanoscale ( IF 5.8 ) Pub Date : 2018-11-01 , DOI: 10.1039/c8nr06115g Yuan Tan 1 , 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
Nanoscale ( IF 5.8 ) Pub Date : 2018-11-01 , DOI: 10.1039/c8nr06115g Yuan Tan 1 , 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
Affiliation
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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.
中文翻译：
多层MoTe2中可控的2H到1T'相变。
大多数二维（2D）过渡金属二硫化碳（TMD）表现出不止一个结构相，从而导致了石墨烯以外的许多杰出的物理学和潜在的器件应用。在这里，我们证明了通过激光辐照在几层二碲化钼（MoTe2）中触发2H到1T'相变的可行途径。在这项研究中系统地研究了激光功率和照射持续时间的影响，揭示了累积的热效应是这种相变的主要驱动力。通过仔细调整激光功率和照射时间，我们可以将MoTe2的结构相控制为2H，2H + 1T'和1T'。在较低温度下进行热退火后，激光照射的MoTe2表现出完全抑制的2H成分和更稳定的1T'相，表明不可逆的2H到1T'相变的微观起源是由于激光局部瞬时加热而在MoTe2中形成了Te空位。我们的发现以及MoTe2的独特性能为基于2D TMD及其异质结构的高性能纳米电子学和光电子学铺平了道路。
更新日期：2018-10-10
中文翻译：
多层MoTe2中可控的2H到1T'相变。
大多数二维（2D）过渡金属二硫化碳（TMD）表现出不止一个结构相，从而导致了石墨烯以外的许多杰出的物理学和潜在的器件应用。在这里，我们证明了通过激光辐照在几层二碲化钼（MoTe2）中触发2H到1T'相变的可行途径。在这项研究中系统地研究了激光功率和照射持续时间的影响，揭示了累积的热效应是这种相变的主要驱动力。通过仔细调整激光功率和照射时间，我们可以将MoTe2的结构相控制为2H，2H + 1T'和1T'。在较低温度下进行热退火后，激光照射的MoTe2表现出完全抑制的2H成分和更稳定的1T'相，表明不可逆的2H到1T'相变的微观起源是由于激光局部瞬时加热而在MoTe2中形成了Te空位。我们的发现以及MoTe2的独特性能为基于2D TMD及其异质结构的高性能纳米电子学和光电子学铺平了道路。
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