Engineering Grain Boundaries in Two-dimensional Electronic Materials.

Engineering the boundary structures in two-dimensional (2D) materials provides an unprecedented opportunity to program the physical properties of the materials with extensive tunability and realize innovative devices with advanced functionalities. However, structural engineering technology is still in its infancy, and creating artificial boundary structures with high reproducibility remains difficult. In this review, we discuss about various emergent properties of 2D materials with different grain boundaries, and the current techniques to control the structures. We also discuss the remaining challenges for scalable and reproducible structure control and our outlook on the future directions of the related techniques. This article is protected by copyright. All rights reserved.