Physics – Condensed Matter – Materials Science
Scientific paper
2010-11-18
Nano Lett., 2010, 10 (11), pp 4702-4707
Physics
Condensed Matter
Materials Science
23 pages, 5 figures in the main text, 1 supporting information, 5 figures and 1 table in the supporting information
Scientific paper
10.1021/nl1029978
The discovery of electric field induced bandgap opening in bilayer graphene opens new door for making semiconducting graphene without aggressive size scaling or using expensive substrates. However, bilayer graphene samples have been limited to um size scale thus far, and synthesis of wafer scale bilayer graphene posts tremendous challenge. Here we report homogeneous bilayer graphene films over at least 2 inch x 2 inch area, synthesized by chemical vapor deposition on copper foil and subsequently transferred to arbitrary substrates. The bilayer nature of graphene film is verified by Raman spectroscopy, atomic force microscopy (AFM), and transmission electron microscopy (TEM). Importantly, spatially resolved Raman spectroscopy confirms a bilayer coverage of over 99%. The homogeneity of the film is further supported by electrical transport measurements on dual-gate bilayer graphene transistors, in which bandgap opening is observed in 98% of the devices.
Lee Kyunghoon
Lee Seunghyun
Zhong Zhaohui
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