  Two-dimensional (2D) materials have received extensive research attentions
over the past two decades due to their intriguing physical properties (such as
the ultrahigh mobility and strong light-matter interaction at atomic thickness)
and a broad range of potential applications (especially in the fields of
electronics and optoelectronics). The growth of single-crystal 2D materials is
the prerequisite to realize 2D-based high-performance applications. In this
review, we aim to provide an in-depth analysis of the state-of-the-art
technology for the growth and applications of 2D materials, with particular
emphasis on single crystals. We first summarize the major growth strategies for
monolayer 2D single crystals. Following that, we discuss the growth of
multilayer single crystals, including the control of thickness, stacking
sequence, and heterostructure composition. Then we highlight the exploration of
2D single crystals in electronic and optoelectronic devices. Finally, a
perspective is given to outline the research opportunities and the remaining
challenges in this field.
