Directed exfoliating and ordered stacking of transition-metal-dichalcogenides.
Directed exfoliating and ordered stacking of transition-metal-dichalcogenides.
复制标题
DOI：
10.1039/d1nr07688d
复制
发表时间：
2021-11
期刊：
影响因子：
6.7
通讯作者：
Yanshuang Li;Xiu-Hua Xie;Binghui Li;Xiaoli Sun;Yichen Yang;Jishan Liu;Ji-Yong Feng;Yingze Zhou;Yuanzheng Li;Weizhe Liu;Shuangpeng Wang;Wei Wang-;Huan Zeng;Zhenzhong Zhang;D. Shen;D. Shen
中科院分区：
文献类型：
--
作者：
Yanshuang Li;Xiu-Hua Xie;Binghui Li;Xiaoli Sun;Yichen Yang;Jishan Liu;Ji-Yong Feng;Yingze Zhou;Yuanzheng Li;Weizhe Liu;Shuangpeng Wang;Wei Wang-;Huan Zeng;Zhenzhong Zhang;D. Shen;D. Shen
二维货车德瓦尔斯晶体通过控制各层的堆叠顺序或扭曲角，为设计物理性质的新颖组合提供了无限的范围。单分子层间的晶格取向不仅对打破工程对称性有重要意义，而且对多体量子相和能带拓扑的研究也有重要意义。到目前为止，最先进的剥离方法集中在质量，尺寸，产量和可扩展性的成就，而缺乏足够的信息晶格取向。因此，层间排列通常由后续实验确定，例如二次谐波产生光谱，这增加了设计人工排序的尝试和错误的次数，并阻碍了系统研究的效率。在此，我们报道了一种晶格取向可区分的剥离方法，通过金有利于沿着特定的原子台阶边缘外延，同时，满足高质量，大尺寸，高产量的单层膜的要求。过渡金属双硫族化合物双层结构由于晶格取向的改变而直接形成了六方和菱方两种堆积构型。光学光谱，电子衍射和角分辨光电子能谱被用来研究晶体质量，对称性断裂，和频带调谐，这支持我们提出的剥离机制。这种策略显示了促进有序堆叠的发展的能力，特别是在未来的多层组装。
Two-dimensional van der Waals crystals provide a limitless scope for designing novel combinations of physical properties by controlling the stacking order or twist angle of individual layers. Lattice orientation between stacked monolayers is significant not only for breaking the engineering symmetry but also for the study of many-body quantum phases and band topology. Thus far the state-of-the-art exfoliation approaches focus on the achievements of quality, size, yield, and scalability, while lacking sufficient information on lattice orientation. Consequently, interlayer alignment is usually determined by later experiments, such as the second harmonic generation spectroscopy, which increase the number of trials and errors for a designed artificial ordering and hampered the efficiency of systematic study. Herein, we report a lattice orientation distinguishable exfoliation method via gold favor epitaxy along the specific atomic step edges, meanwhile, fulfilling the requirements of high-quality, large-size, and high-yield monolayers. Hexagonal- and rhombohedral-stacking configurations of bilayer transition metal dichalcogenides are built directly at once as a result of foreseeing the lattice orientation. Optical spectroscopy, electron diffraction, and angle-resolved photoemission spectroscopy are used to study crystal quality, symmetric breaking, and band tuning, which support the exfoliating mechanism we proposed. This strategy shows the ability to facilitate the development of ordering stacking especially for multilayers assembling in the future.