Dresden 2017 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 58: Nanomaterials I

MM 58.6: Talk

Thursday, March 23, 2017, 11:30–11:45, IFW D

Alternative substrate materials for silicene: WSe₂ and MgX₂ (X = Cl, Br, and I) — •Udo Schwingenschlögl and Jiajie Zhu — King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division (PSE), Thuwal 23955-6900, Saudi Arabia

Silicene is the Si analogue of graphene with honeycomb structure and characteristic Dirac states, while being fully compatible with current Si-based nano-electronics. It can be prepared on metallic substrates, such as Ag(111), Ir(111) and ZrB₂(0001), but a strong interaction regrettably perturbes the electronic states. Semiconducting Si(111) and SiC(0001) substrates, on the other hand, require surface passivation due to dangling bonds, which complicates the preparation procedure. We employ first-principles calculations in order to identify alternative substrate materials, focussing on layered compounds, because a weak interaction with silicene is expected. Both WSe₂ and MgX₂ (X = Cl, Br and I) turn out to be interesting candidates. The effects of these substrates on the properties of silicene are analyzed and discussed with respect to technological requirements.

References:

- Journal of Materials Chemistry C 3, 3946-3953 (2015)

- ACS Applied Materials & Interfaces 6, 11675-11681 (2014)