123rd General Meeting of the KCS

Type Symposium
Area Synthesis and Application of Multifunctional Nanocatalyst Materials
Room No. Room 405+406
Time THU 16:55-17:20
Code MAT1-4
Subject Single-crystal 2D heterostructure on wafer scale
Authors Soo Min Kim
Korea Institute of Science and Technology, Korea
Abstract Although polycrystalline hexagonal boron nitride (PC-hBN) has been realized, defects and grain boundaries still cause charge scatterings and trap sites, impeding high-performance electronics. Here, we report a method of synthesizing wafer-scale single- crystalline hBN (SC-hBN) monolayer films by chemical vapor deposition. The limited solubility of boron (B) and nitrogen (N) atoms in liquid gold promotes high diffusion of adatoms on the surface of liquid at high temperature to provoke the circular hBN grains. These further evolve into closely packed unimodal grains by means of self-collimation of B and N edges inherited by electrostatic interaction between grains, eventually forming an SC-hBN film on a wafer scale. This SC-hBN film also allows for the synthesis of wafer-scale graphene/hBN heterostructure and single-crystalline tungsten disulfide.
E-mail smkim@kist.re.kr