Deeply Exploring Anisotropic Evolution toward Large-Scale Growth of Monolayer ReS2

Among large numbers of transition metal dichalcogenides (TMDCs), monolayer of Rhenium disulfide (ReS2) is of particular interest due to its unique structural anisotropy, which opens up unprecedented opportunities in dichroic atomical electronics. Understanding the domain structure and controlling the anisotropic evolution of ReS2 during the growth is considered critical for increasing the domain size towards a large-scale growth of monolayer ReS2. Herein, by employing angle-resolved Raman spectroscopy, we reveal that the hexagonal ReS2 domain is constructed by six well-defined subdomains with each b-axis parallel to the diagonal of the hexagon. Further combined the first-principles calculations and the transmission electron microscopy (TEM) characterizations, a dislocation involved anisotropic evolution is proposed to explain the formation of the domain structures and understand the limitation of the domain size. Based on these findings, growth rates of different crystal planes are well controlled to enla...