Insight into the mechanisms of chemical doping of graphene on silicon carbide

Nanotechnology
Filippo Giannazzo

Abstract

Graphene (Gr) is currently the object of intense research investigations, owing to its rich physics and wide potential for applications. In particular, epitaxial Gr on silicon carbide (SiC) holds great promise for the development of new device concepts based on the vertical current transport at Gr/SiC heterointerface. Precise tailoring of Gr workfunction (WF) represents a key requirement for these device structures. In this context, Günes et al (2015 Nanotechnology 26 445702) recently reported a straightforward approach for WF modulation in epitaxial Gr on silicon carbide by using nitric acid solutions at different dilutions. This paper provides a deep insight on the peculiar mechanisms of chemical doping of epitaxial Gr on 4H-SiC(0001), using several characterization techniques (Raman, UPS, AFM) and density functional theory calculations. The relevance of these findings and their perspective applications in emerging device concepts based on monolithic integration of Gr and SiC will be discussed.

References

Feb 10, 2009·Nature Materials·Konstantin V EmtsevThomas Seyller
Jan 19, 2010·Nature Nanotechnology·Alexander TzalenchukSergey Kubatkin
Feb 6, 2010·Science·Y-M LinPh Avouris
Jun 22, 2010·Nature Nanotechnology·Sukang BaeSumio Iijima
Mar 28, 2013·ACS Nano·Giuseppe NicotraFilippo Giannazzo
Oct 13, 2015·Nanotechnology·Fethullah GünesMohamed Boutchich

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