Zhang Xingxing, Dai Jiuxiang, Jin Zhitong, Tao Xinwei, Zhong Yunlei, Zheng Zemin, Hu Xianyu, Zhou Lin
School of Chemistry and Chemical Engineering, Frontiers Science Centre for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China.
Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Division of Advanced Materials, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China.
iScience. 2024 Mar 2;27(4):109378. doi: 10.1016/j.isci.2024.109378. eCollection 2024 Apr 19.
Reliable synthesis methods for high-quality, large-sized, and uniform two-dimensional (2D) transition-metal dichalcogenides (TMDs) are crucial for their device applications. However, versatile approaches to growing high-quality, large-sized, and uniform 2D transition-metal tellurides are rare. Here, we demonstrate an ion adsorption strategy that facilitates the Frank-van der Merwe growth of 2D transition-metal tellurides. By employing this method, we grow MoTe and WTe with enhanced lateral size, reduced thickness, and improved uniformity. Comprehensive characterizations confirm the high quality of as-grown MoTe. Moreover, various characterizations verify the adsorption of K and Cl ions on the top surface of MoTe. X-ray photoelectron spectroscopy (XPS) analysis reveals that the MoTe is stoichiometric without K and Cl ions and exhibits no discernable oxidation after washing. This top surface control strategy provides a new controlling knob to optimize the growth of 2D transition-metal tellurides and holds the potential for generalized to other 2D materials.
可靠的高质量、大尺寸且均匀的二维（2D）过渡金属二硫属化物（TMDs）合成方法对其器件应用至关重要。然而，用于生长高质量、大尺寸且均匀的二维过渡金属碲化物的通用方法却很少见。在此，我们展示了一种离子吸附策略，该策略有助于二维过渡金属碲化物的弗兰克 - 范德梅尔外延生长。通过采用这种方法，我们生长出了横向尺寸增大、厚度减小且均匀性提高的MoTe₂和WTe₂。全面的表征证实了所生长的MoTe₂的高质量。此外，各种表征验证了K⁺和Cl⁻离子在MoTe₂顶表面的吸附。X射线光电子能谱（XPS）分析表明，MoTe₂在没有K⁺和Cl⁻离子的情况下是化学计量的，并且在洗涤后没有明显的氧化现象。这种顶表面控制策略为优化二维过渡金属碲化物的生长提供了一个新的控制旋钮，并具有推广到其他二维材料的潜力。
