Raman spectroscopy of epitaxial graphene on a SiC substrate
By Zhenhua Ni, Wei Chen, Xiaofeng Fan, J. Kuo, Ting Yu, A. Wee, Zexiang Shen. 2008
495 citations recorded by the source corpus.
may speed up the application of graphene for future electronic devices. The interaction of EG and the SiC substrate is critical to its electronic and physical properties. In this work, the Raman spectroscopy was used to study the structure of EG and its interaction with SiC substrate. All the Raman bands of EG blueshift from that of bulk graphite and graphene made by micromechanical cleavage, which was attributed to the compressive strain induced by the substrate. A model containing 13 13 honeycomb lattice cells of graphene on carbon nanomesh was constructed to explain the origin of strain. The lattice mismatch between graphene layer and substrate causes the compressive stress of 2.27 GPa on graphene. We also demonstrate that the electronic structures of EG grown on Si- and C-terminated SiC substrates are quite different. Our experimental results shed light on the interaction between graphene and SiC substrate, which are critical to the future applications of EG.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/3c637e5a9501fa3998cf92f1ed02600198af14fc
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Citations in the corpus
- Surface transfer doping of semiconductors (2009, background): “ing significant blue shift of the G (1597 cm ) and 2D (2715 cm ) bands of single layer EG as compared to that of single layer MCG (G band at 1580 cm 1 and 2D band at 2673 cm ) [137].”
- Raman Spectroscopic Characterization of Graphene (2010, unknown): “For a hexagonal system, the strain ε induced by an biaxial stress can be expressed as (91, 92) ⎡ ⎢⎢⎢⎢⎣ εxx εyy εzz εyz εzx εxy ⎤ ⎥⎥⎥⎥⎦ = ⎡ ⎢⎢⎢⎢⎣ S11 S12 S13 S12 S11 S13 S13 S13 S33 S44 S44 2(S11 − S12) ⎤ ⎥⎥⎥⎥⎦ ⎡ ⎢⎢⎢⎢⎣ σ σ”
- Epitaxial-Graphene RF Field-Effect Transistors on Si-Face 6H-SiC Substrates (2009, result): “entire 2-in wafer by analyzing 2-D Raman peaks, similar to previous reports [11].”