Na2SO4-Regulated High-Quality Growth of Transition Metal Dichalcogenides by Controlling Diffusion
Na2SO4-Regulated High-Quality Growth of Transition Metal Dichalcogenides by Controlling Diffusion
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Na2SO4 通过控制扩散调节过渡金属二硫属化物的高质量生长
DOI：
10.1021/acs.chemmater.0c01089
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发表时间：
2020-07-14
影响因子：
8.6
通讯作者：
Liu, Song
中科院分区：
文献类型：
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作者：
Jin, Yuanyuan;Cheng, Miao;Liu, Song
硫相对于金属氧化物的高扩散速率产生偏离化学计量比的前驱体，导致生长的过渡金属二硫族化合物（TMDCs）生长可控性差和缺陷。引入高熔点硫前驱体是解决这些问题的一个有希望的策略。本文首先介绍了硫酸钠（Na2SO4）作为硫前驱体，它在调节源前驱体的扩散和平衡其基于Na2SO4的温控分解的质量通量中起作用。通过对中间体组成的表征，推导出了具体的生长过程；结果表明，硫源和金属源的排放是同步释放的，并且跨越了整个生长阶段。这种温度控制的供源系统减少了硫和金属之间的扩散间隙，从而促进了反应的更快动力学。此外，该方法对其他TMDCs的生产也具有广泛的适用性。
The high diffusion rate of sulfur with respect to metal oxide creates precursors that deviate from the stoichiometric ratio, leading to poor growth controllability and defects in the as-grown transition metal dichalcogenides (TMDCs). The introduction of a sulfur precursor with a high melting point is a hopeful strategy to solve these problems. Here, we first introduce sodium sulfate (Na2SO4) as a sulfur precursor, which plays roles in tuning diffusion of source precursors and balancing their mass flux based on the temperature-confined decomposition of Na2SO4. We deduced the specific growth process by characterizing the composition of intermediates; the results show that emissions of sulfur and metal sources were synchronously released and spanning the entire growth stage. This temperature-controlled source-feeding system reduced the diffusion gap between sulfur and metal, which promoted a faster kinetics for reactions. Moreover, this method has the wide applicability for producing other TMDCs.