凯发

Two-dimensional (2D) materials, such as graphene, hexagonal boron nitride (h-BN), transition metal dichalcogenides (TMDs), topological insulators (TIs), and the more recent silicene and germanene, etc., have stable crystalline structures and unique electronic properties, representing the new frontier of advanced materials research. The synthesis of high-quality and large-area 2D materials is thus of critical importance both in basic science and in real applications.  As the first truly 2D material, graphene continues to stay in the spotlight and has become a paradigm in this field. In this talk I will discuss the synthesis of large single crystalline monolayer (centimeter scale) and bilayer graphene (millimeter scale) using chemical vapor deposition, which show superior electronic performance comparable to those exfoliated from natural graphite. Detailed growth kinetics study combining theoretical efforts has revealed the remarkable effects of trace amounts of oxygen impurities in the growth system, and sheds insight into future routes for synthesizing other 2D materials, such as TMDs, TIs, and vertical/lateral 2D heterostructures. Scalable synthesis of these new 2D materials is expected to lead to revolutionary applications in electronic, photonic, and energy harvesting devices and systems.