Effect of 6H-SiC (1120) substrate on epitaxial graphene revealed by Raman scattering

doi:10.1088/1674-1056/22/1/016301

Abstract A nonpolar SiC(11

0) substrate has been used to fabricate epitaxial graphene (EG). Two EGs with layer numbers of 8-10 (referred to as MLG) and 2-3 (referred to as FLG) were used as representative to study the substrate effect on EG through temperature dependent Raman scattering. It is found that Raman lineshifts of G and 2D peaks of the MLG with temperature are consistent with that of a free graphene predicted by theory calculation, indicating that the substrate influence on the MLG is undetectable. While Raman G peak lineshifts of the FLG to that of the free graphene are obvious, however, its lineshift rate (-0.016 cm^-1/K) is almost one third of that (-0.043 cm^-1/K) of a EG on 6H-SiC (0001) in the temperature range from 300 K to 400 K, indicating a weak substrate effect from SiC (11

0) on the FLG. This renders the FLG a high mobility around 1812 cm²- ·V^-1·s^-1 at room temperature even with a very high carrier concentration about 2.95× 10¹³ cm^-2 (p-type). These suggest SiC (11

0) is more suitable for fabricating EG with high performance.

Keywords: epitaxial grapheme 6H-SiC (1120) temperature dependent Raman scattering

Received: 05 July 2012
Revised: 06 September 2012
Accepted manuscript online:

PACS:	63.22.Rc	(Phonons in graphene)
	63.20.Ry	(Anharmonic lattice modes)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2011CB932700), the Knowledge Innovation Project of Chinese Academy of Science (Grant No. KJCX2-YW-W22), and the National Natural Science Foundation of China (Grant Nos. 51072223 and 50972162).

Corresponding Authors: Guo Li-Wei
E-mail: lwguo@iphy.ac.cn

Cite this article:

Lin Jing-Jing (林菁菁), Guo Li-Wei (郭丽伟), Jia Yu-Ping (贾玉萍), Chen Lian-Lian (陈莲莲), Lu Wei (芦伟), Huang Jiao (黄郊), Chen Xiao-Long (陈小龙) Effect of 6H-SiC (1120) substrate on epitaxial graphene revealed by Raman scattering 2013 Chin. Phys. B 22 016301

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Effect of 6H-SiC (1120) substrate on epitaxial graphene revealed by Raman scattering

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