Journal
PHYSICAL REVIEW B
Volume 80, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.041401
Keywords
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Funding
- Department of Energy-Basic Sciences [DE-AC02-07CH11358]
- W. M. Keck Foundation and the National Science Foundation [0404084, 0521041, 0820382]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [820382] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0404084, 0521041] Funding Source: National Science Foundation
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The inability to grow large well-ordered ultra high vacuum (UHV) graphene with a specific number of layers on SiC(0001) is well known. The growth involves several competing processes (Si desorption, carbon diffusion, island nucleation, etc.) and because of the high temperatures, it has not been possible to identify the growth mechanism. Using scanning tunneling microscopy and a vicinal 6H-SiC(0001) sample, we determine that the Si desorption from steps is the main controlling process. Adjacent steps retract with different speeds and the released carbon produces large areas of bilayer graphene with characteristic fingers emanating from steps. If faster heating rates are used, the different Si desorption rates are avoided and single-layer graphene films extending over many microns are produced.
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