期刊
NANO LETTERS
卷 17, 期 3, 页码 1474-1481出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b04491
关键词
MoSe2; WSe2; 2D material; CVD growth; liquid crystal alignment; grain; grain boundaries
类别
资金
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korean government's Ministry of Trade, Industry, and Energy [20154030200630]
- industrial research innovation program [10051701]
- Ministry of Trade, Industry, and Energy (MOTIE)
- Korean Government [2010-0020207]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20154030200630] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Direct observation of grains and boundaries is a vital factor in altering the electrical and optoelectronic properties of transition metal dichalcogenides (TMDs), that is, MoSe2, and WSe2. Here, we report visualization of grains and boundaries of chemical vapor deposition grown MoSe2 and WSe2 on silicon, using optical birefringence of two-dimensional layer covered with nematic liquid crystal (LC). An in-depth study was performed to determine the alignment orientation of LC molecules and their correlation with other grains. Interestingly, we found that alignment of liquid crystal has discrete preferential orientations. From computational simulations, higher adsorption energy for the armchair direction was found to force LC molecules to align on it, compared to that of the zigzag direction. We believe that these TMDs with three-fold symmetric alignment could be utilized for display applications.
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