Influence of seeding promoters on the properties of CVD grown monolayer molybdenum disulfide
Influence of seeding promoters on the properties of CVD grown monolayer molybdenum disulfide
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晶种促进剂对 CVD 生长单层二硫化钼性能的影响
DOI：
10.1007/s12274-019-2294-y
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发表时间：
2019
期刊：
影响因子：
9.9
通讯作者：
Cong Chunxiao
中科院分区：
文献类型：
--
作者：
Yang Peng;Yang Ai-Guo;Chen Lingxiu;Chen Jing;Zhang Youwei;Wang Haomin;Hu Laigui;Zhang Rong-Jun;Liu Ran;Qu Xin-Ping;Qiu Zhi-Jun;Cong Chunxiao
化学气相沉积(CVD)是高质量生长大面积二维过渡金属二碳化合物(TMDCs)最有效的方法。单层二硫化钼(MoS_2)和晶种助剂分别是这种CVD工艺最常用的二维TMDC和生长策略。虽然种子催化剂在促进成核、获得更高的产率和更好的重复性方面的优势以及它们对生长的MoS2形貌的影响已经得到了研究，但对于种子促进剂对生长的MoS2单层的光学和电学性质的影响还不是很全面，这对于理解这种新兴的2D半导体的基础物理和开发实际应用确实是至关重要的。在本报告中，我们系统地研究了不同的晶种促进剂对化学气相沉积生长的MoS_2单层性质的影响。研究发现，不同的种子分子对生长的MoS_2单层膜的光电性质有不同的影响。3，4，9，10-四羧酸四钾盐(PTAS)、铜酞菁(CuPc)和结晶紫(CV)三种不同的晶种催化剂中，PTAS比其它两种催化剂更能获得光学质量好、电迁移率高的大面积单层MoS2。我们的工作为在种子助剂辅助合成过程中对生长的单层MoS_2和其他二维过渡金属二盐基化物的性质的修饰提供了指导。
Chemical vapor deposition (CVD) is the most efficient method to grow large-area two dimensional (2D) transition metal dichiacogenides (TMDCs) in high quality. Monolayer molybdenum disulfide (MoS2) and seed-assistant are the mostly selected 2D TMDC and growth strategy for such CVD processes, respectively. Though the advantages of seed catalysts in facilitating the nucleation, achieving higher yield and better repeatability, as well as their effects on the morphologies of as-grown MoS2have been studied, the influence of seeding promoters on both optical and electrical properties of as-grown monolayer MoS2is not known comprehensively, which is indeed critical for understanding fundamental physics and developing practical application of such emerging 2D semiconductors. In this report, we systematically investigated the effect of different seeding promoters on the properties of CVD-grown monolayer MoS2. It is found that different seed molecules lead to different impacts on the optical and electrical properties of as-grown monolayer MoS2. Among three different seed catalysts (perylene-3,4,9,10-tetracarboxylic acid tetrapotassium salt (PTAS), copper phthalocyanine (CuPc), and crystal violet (CV)), PTAS performs better in obtaining large area monolayer MoS2with good optical quality and high electrical mobility than the other two. Our work gives a guide for modifying the properties of as-grown monolayer MoS2and other 2D transition metal dichalcogenides in seeding promoters-assisted synthesis process.