SiC surface orientation and Si loss rate effects on epitaxial graphene

Title
SiC surface orientation and Si loss rate effects on epitaxial graphene
Author
이조원
Keywords
LARGE-AREA; FILMS; CARBON
Issue Date
2012-03
Publisher
Springer
Citation
Nanoscale Research Letters, 2012, 7(1), 186
Abstract
We have explored the properties of SiC-based epitaxial graphene grown in a cold wall UHV chamber. The effects of the SiC surface orientation and silicon loss rate were investigated by comparing the characteristics of each formed graphene. Graphene was grown by thermal decomposition on both the silicon (0001) and carbon (000-1) faces of on-axis semi-insulating 6H-SiC with a "face-down" and "face-up" orientations. The thermal gradient, in relation to the silicon flux from the surface, was towards the surface and away from the surface, respectively, in the two configurations. Raman results indicate the disorder characteristics represented by I-D/I-G down to < 0.02 in Si-face samples and < 0.05 in C-faces over the 1 cm(2) wafer surface grown at 1,450A degrees C. AFM examination shows a better morphology in face-down surfaces. This study suggests that the optimum configuration slows the thermal decomposition and allows the graphene to form near the equilibrium. The Si-face-down orientation (in opposition to the temperature gradient) results in a better combination of low disorder ratio, I-D/I-G, and smooth surface morphology. Mobility of Si-face-down orientation has been measured as high as approximately 1,500 cm(2)/Vs at room temperature. Additionally, the field effect transistors have been fabricated on both Si-face-down and C-face-down showing an ambipolar behavior with more favorable electron conduction.
URI
https://nanoscalereslett.springeropen.com/articles/10.1186/1556-276X-7-186http://repository.hanyang.ac.kr/handle/20.500.11754/69467
ISSN
1931-7573
DOI
10.1186/1556-276X-7-186
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GRADUATE SCHOOL[S](대학원) > CONVERGENCE NANOSCIENCE(나노융합과학과) > Articles
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