Direct growth of graphene on SiC(0001) by KrF-excimer-laser irradiation.
Appl Phys Lett
; 108(9): 093107, 2016 Feb 29.
Article
en En
| MEDLINE
| ID: mdl-27019515
ABSTRACT
In this report, we propose a direct patterning method of graphene on the SiC(0001) surface by KrF-excimer-laser irradiation. In this method, Si atoms are locally sublimated from the SiC surface in the laser-irradiated area, and direct graphene growth is induced by the rearrangement of surplus carbon on the SiC surface. Using Raman microscopy, we demonstrated the formation of graphene by laser irradiation and observed the growth process by transmission electron microscopy and conductive atomic force microscopy. When SiC was irradiated by 5000 shots of the laser beam with a fluence of 1.2 J/cm2, two layers of graphene were synthesized on the SiC(0001) surface. The number of graphene layers increased from 2 to 5-7 with an increase in the number of laser shots. Based on the results of conductive-atomic force microscopy measurements, we conclude that graphene formation was initiated from the step area, after which the graphene grew towards the terrace area by further Si evaporation and C recombination with increasing laser irradiation.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Appl Phys Lett
Año:
2016
Tipo del documento:
Article
País de afiliación:
Japón