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Daniele Stradi: Stacking effects in two-dimensional devices based on gra-phene electrodes

posted 17 Jun 2015, 05:50 by info admin

Center for Nanostructured Graphene, DTU Nanotech, Technical University of Denmark, Kgs. Lyngby 2800, Denmark

Two-dimensional (2D) semiconductors such as transition metal dichalcogenides (TMDs) are attracting considerable interest as novel materials for atomically thin and flexible field-effect transistor (FET) devices. Recently, a promising FET setup has been proposed which employs graphene as the electrode material to provide gate-tunable resistance at the contact, and van der Waals assembly to protect the device from the environment by encapsulation [1-3]. Using largescale quantum transport simulations, we have investigated the role of the stacking order in a layered device formed by a MoS2 channel contacted by graphene electrodes, with the aim of providing guidelines on how to shape the device in order to achieve maximum performance. We show that the stacking order of the 2D layers dramatically impacts the distribution of carriers at the interface between the graphene and the TMD in the gated device, which ultimately determines its electronic transport characteristics. Our results are relevant for the design of electrode-semiconductor interfaces in FETs based entirely on two-dimensional materials.

1. X. Cui et al., Nature Nanotech., AOL, doi:10.1038/nnano.2015.70
2. Y. Liu et al., Nano Lett., 15, 3030 (2015)
3. Avsar A. et al. ACS Nano, 9, 4138 (2015)


Daniele Stradi is Hans Christian Ørsted fellow in the Theoretical Nanoelectronics group (Prof. Mads Brandbyge) at the Center for Nanostructured Graphene and at DTU Nanotech, Technical University of Denmark. His current research interests focus on the investigation of graphene as an electrode material using first-principles quantum transport simulations. He received his B.Sc. degree in Chemistry from the University of Trieste (2009) and his Ph.D. in Theoretical Chemistry from the Autonomous University of Madrid (2013), with a thesis on the chargetransfer properties of organic monolayers self-assembled on epitaxial graphene.