linyou Cao - 石墨烯大会

演讲嘉宾-linyou Cao

linyou Cao
北卡罗莱纳州立大学博士

Dr. Linyou Cao is an assistant professor of Materials Science and Engineering at North Carolina State University (NCSU). He received his PhD degree from the Department of Materials Science and Engineering at Stanford in 2010, and held a Miller Research Fellowship at the University of California, Berkeley prior to joining the faculty of NCSU August 2011. His group works on the photophysics and photochemistry of nanoscale materials, including 2D TMDC materials and dielectric metamaterials. Dr. Cao received a Ralph E. Powe Junior Faculty Enhancement Award from the Oak Ridge Associated Universities in 2012, a Young Investigator Award from the Army Research Office and a CAREER award from the National Science Foundation in 2013.

演讲题目：2D TMDC Materials and Heterostructures: Towards the Age of Atomic-scale Photonics

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内容摘要

Two-dimensional (2D) transition metal chalcogenide (TMDC) materials have been emerging as one central topic of the entire physical science and engineering. These materials show remarkable excitonic properties and offer a tantalizing prospect of scaling all kinds of semiconductor photonic devices down to a truly atomic scale! These include photodetectors, solar cells, LEDs, lasers, and optical modulators.

In this talk, I will first introduce a unique self-limiting chemical vapor deposition process that my groups has recently developed for the synthesis of high-quality centimeter-scale 2D MoS2 with controlled layer numbers. I will then demonstrate a unique surface energy-assisted transfer process developed in my group that can perfectly transfer the synthesized centimeter-scale films onto arbitrary substrates with no observable wrinkles and damages. These capabilities of controlled scalable synthesis and transfer open up enormous unexplored opportunities for fundamental and applied research.

Of our most interest are the photophysics and photochemistry of 2D materials. I will show our studies on the refractive index and catalytic activities of 2D MoS2, both of which show a clear dependence on the layer number of 2D MoS2. Additionally, I will present our recent results on the excitonic dynamics in 2D heterstroctures that consists of multiple dissimilar monolayers epitaxially or non-epitaxially stacked in the vertical direction. Our results indicate extremely efficient interlayer relaxation and transition of exictons in the 2D heterostructures. This suggests that 2D heterostructures may provide unprecedented capabilities to engineer excitons for the development of exotic photonic devices.