Two-Dimensional Materials and Their Potential Applications
Title：Two-Dimensional Materials and Their Potential Applications
Invited Speaker：Associate Prof. Lain-Jong Li
Physical Sciences and Engineering Division
University of Science and Technology
Kingdom of Saudi Arabia
Room：Central Multi-function Hall
Time：3:00 pm, May 10, 2016
Abstract：Atomically thin 2D Transition metal dichalcogenide (TMD) materials provide a wide range of basic building blocks with unique electrical, optical, and thermal properties which do not exist in their bulk counterparts. Our recent demonstration in vapor phase growth of TMD monolayer has stimulated the research in growth and applications. In this presentation, I would start with the discussion on the synthesis and characterizations of crystalline MoS2 and WSe2 monolayers. These layer materials can be transferred to desired substrates, making them suitable building blocks for constructing multilayer stacks for various applications. Heterostructures of 2d materials formed by vertical stacking have been realized recently via transfer of their exfoliated flakes, where their properties are dominated by the stacking orientation and strength of interlayer coupling. The method to determine valence band and conduction band alignment for various TMD materials is proposed. Another very attractive structure is the lateral heterostructure, where the junction is atomically sharp and the active region can be as narrow as few strings of atoms at the junction areas. This structure offers much easier band offset tuning since materials are spatially separated. The direct growth of such lateral heterostructures will be presented. These unique 2D heterostructures have abundant implications for many potential applications.
