Synthesis of wafer-scaled single-crystal 2D layered materials via chemical vapor deposition

Two-dimensional (2D) materials including graphene, hexagonal boron nitride, and transition metal dichalcogenide have been paid attentions due to unusual intrinsic physical and chemical properties such as high exciton binding energy and large magnetic resistance. Such unusual properties allow unprecedented applications. To realize the intrinsic material properties and industrial applications, wafer-scaled single-crystal 2D films are highly required. Here, I present the recent progress of single-crystal growth for 2D van der Waals materials in a wafer scale via the self-collimation on liquid substrate and the epitaxial growth on self- atomic sawtooth surface. The detailed growth mechanism is discussed accordingly.