IEEE EDS Chapter presents: 2D Materials: Advances in Synthesis, Doping, and Contacts

Abstract: This talk will describe recent advances in synthesis and doping of two-dimensional materials. In Our synthesis efforts focus on (1) growing ultra-pure crystals of transition metal dichalcogenides (TMDs), which show dramatic improvements in performance compared to commercially obtained TMDs and new techniques for graphene chemical vapor deposition; and (2) new strategies for graphene CVD synthesis based on removing trace impurities to below the parts-per-billion level, which dramatically improves both the speed and reproducibility of graphene synthesis. The second part of the talk will describe the use of oxidized tungsten selenide as a low-disorder hole-dopant for graphene. The doping level can be controlled through the use of tungsten selenide spacer layers, which also dramatically improves the graphene mobility by spatially separating the dopant layer from the graphene. The doped graphene is highly transparent in the infrared, and can be used as an ultralow-loss conducting layer for infrared photonics. The doped graphene shows strong plasmonic response, and local doping can be used to create engineered plasmonic structures. The third part of the talk will describe our efforts to understand the behavior of metallic contacts to semiconducting TMDs. We find that metal-TMD contacts that are assembled non-invasively show a combination of low contact resistance and ultra-long transfer length – putting them in a very different regime from traditional metal-semiconductor contacts.

Biography: James Hone is currently Wang Fong-Jen Professor and Chair of the Department of Mechanical Engineering at Columbia University. He was director of Columbia’s Materials Science Research and Engineering Center (MRSEC) from 2014-2021. He received his BS in physics from Yale in 1990, and PhD in experimental condensed matter physics from UC Berkeley in 1998, and did postdoctoral work at the University of Pennsylvania and Caltech, where he was a Millikan Fellow. He joined the Columbia faculty in 2003.

Bldg: 101 Davis Hall, Department of Electrical Engineering, University at Buffalo, Amherst, New York, United States, Virtual: https://events.vtools.ieee.org/m/313481