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Well-Hidden Grain Boundary in the Monolayer MoS2 Formed by a Two-Dimensional Core–Shell Growth Mode
ACS Nano ( IF 15.8 ) Pub Date : 2017-09-22 00:00:00 , DOI: 10.1021/acsnano.7b06232 Wenting Zhang , Yue Lin , Qi Wang , Weijie Li , Zhifeng Wang , Jiangluqi Song , Xiaodong Li , Lijie Zhang 1 , Lixin Zhu 2 , Xiaoliang Xu 2
ACS Nano ( IF 15.8 ) Pub Date : 2017-09-22 00:00:00 , DOI: 10.1021/acsnano.7b06232 Wenting Zhang , Yue Lin , Qi Wang , Weijie Li , Zhifeng Wang , Jiangluqi Song , Xiaodong Li , Lijie Zhang 1 , Lixin Zhu 2 , Xiaoliang Xu 2
Affiliation
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Guided by the hexagonal lattice symmetry, triangles and hexagons are the most basic morphological units for two-dimensional (2D) transition metal dichalcogenides (TMDs) synthesized by chemical vapor deposition (CVD). Also, it is widely acknowledged that these units start from the single nucleation site and then grow epitaxially. Accordingly, the triangular monolayer (ML) samples are generally considered as single crystals. Here, we report a 2D core–shell growth mode in the CVD process for ML-MoS2, which leads to one kind of “pseudo” single-crystal triangles containing triangular outline grain boundaries (TO-GBs). It is difficult to be optically distinguished from the “true” single-crystal triangles. The weakening of Raman peaks and the remarkable enhancement of photoluminescence (PL) are found at the built-in TO-GBs, which could be useful for high-performance optoelectronics. In addition, the electrical measurements indicate that the TO-GBs are conductive. Furthermore, TO-GBs and the common grain boundaries (CO-GBs) can coexist in a single flake, whereas their optical visibility and optical modifications (Raman and PL) are quite different. This work is helpful in further understanding the growth mechanism of 2D TMD materials and may also play a significant role in related nanodevices.
中文翻译：
二维核-壳生长模式形成的单层MoS 2中隐蔽的晶界
在六边形晶格对称性的指导下，三角形和六边形是通过化学气相沉积（CVD）合成的二维（2D）过渡金属二卤化金属（TMD）的最基本形态单位。同样，众所周知，这些单元从单个成核位置开始，然后外延生长。因此，通常将三角形单层（ML）样品视为单晶。在这里，我们报告了CVD过程中ML-MoS 2的2D核-壳生长模式，这会导致一种包含三角形轮廓晶界（TO-GB）的“伪”单晶三角形。从光学上很难与“真正的”单晶三角形区分开。内置的TO-GB可以发现拉曼峰的减弱和光致发光（PL）的显着增强，这可能对高性能光电器件有用。另外，电学测量表明TO-GB导电。此外，TO-GB和共同的晶界（CO-GB）可以共存于单个薄片中，而它们的光学可见性和光学修饰（拉曼和PL）却大不相同。这项工作有助于进一步了解2D TMD材料的生长机理，并且可能在相关的纳米器件中起重要作用。
更新日期：2017-09-23
中文翻译：
二维核-壳生长模式形成的单层MoS 2中隐蔽的晶界
在六边形晶格对称性的指导下，三角形和六边形是通过化学气相沉积（CVD）合成的二维（2D）过渡金属二卤化金属（TMD）的最基本形态单位。同样，众所周知，这些单元从单个成核位置开始，然后外延生长。因此，通常将三角形单层（ML）样品视为单晶。在这里，我们报告了CVD过程中ML-MoS 2的2D核-壳生长模式，这会导致一种包含三角形轮廓晶界（TO-GB）的“伪”单晶三角形。从光学上很难与“真正的”单晶三角形区分开。内置的TO-GB可以发现拉曼峰的减弱和光致发光（PL）的显着增强，这可能对高性能光电器件有用。另外，电学测量表明TO-GB导电。此外，TO-GB和共同的晶界（CO-GB）可以共存于单个薄片中，而它们的光学可见性和光学修饰（拉曼和PL）却大不相同。这项工作有助于进一步了解2D TMD材料的生长机理，并且可能在相关的纳米器件中起重要作用。
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