Abstract

Interactions between epitaxial graphene grown on Si- and C-faces were investigated using Raman imaging and tip-enhanced Raman scattering (TERS). In the TERS spectrum, which has a spatial resolution exceeding the diffraction limit, a D band was observed not from graphene surface, but from the edges of the epitaxial graphene ribbons without a buffer layer, which interacts with SiC on the Si-face. In contrast, for a graphene micro-island on the C-face, the D band disappeared even on the edges where the C atoms were arranged in armchair configurations. The disappearance of the edge chirality via combination between the C atoms and SiC on the C-face is responsible for this phenomenon. The TERS signals from the C-face were weaker than those from the Si-face without the buffer layer. On the Si-face with a buffer layer, the graphene TERS signal was hardly observed. TERS enhancement was suppressed by interactions on the edges or by the buffer layer between the SiC and graphene on the C- or Si-face, respectively.

© 2020 The Author(s)

Temperature and doping dependence of the Raman scattering in 4H-SiC

Yan Peng, Xiaobo Hu, Xiangang Xu, Xiufang Chen, Juan Peng, Jisheng Han, and Sima Dimitrijev
Opt. Mater. Express 6(9) 2725-2733 (2016)

Quality evaluation of homopetaxial 4H-SiC thin films by a Raman scattering study of forbidden modes

Lingyu Wan, Dishu Zhao, Fangze Wang, Gu Xu, Tao Lin, Chin-Che Tin, Zhaochi Feng, and Zhe Chuan Feng
Opt. Mater. Express 8(1) 119-127 (2018)

Electro-optical properties of a graphene device on a tip-enhanced Raman spectroscopy system

Ary Portes, Rafael Nadas, Ado Jorio, and Jhonattan C. Ramirez
Opt. Lett. 49(4) 871-874 (2024)

Optical limiting in multilayer graphene films on a cobalt buffer-layer produced by the sputtering technique

Luiz M. M. Barreto, Davinson M. da Silva, Antonio D. Santos, Koiti Araki, Cid B. de Araújo, and Luciana R. P. Kassab
Appl. Opt. 62(8) C122-C127 (2023)

High spatial resolution ellipsometer for characterization of epitaxial graphene

Peter E. Gaskell, Helgi S. Skulason, Wlodek Strupinski, and Thomas Szkopek
Opt. Lett. 35(20) 3336-3338 (2010)