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Rodney S. Ruoff
다차원 탄소재료 연구단
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Oxygen-activated growth and bandgap tunability of large single-crystal bilayer graphene Highly Cited Paper

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Title
Oxygen-activated growth and bandgap tunability of large single-crystal bilayer graphene
Author(s)
Yufeng Hao; Lei Wang; Yuanyue Liu; Hua Chen; Xiaohan Wang; Cheng Tan; Shu Nie; Ji Won Suk; Tengfei Jiang; Tengfei Liang; Junfeng Xiao; Wenjing Ye; Cory R. Dean; Boris I. Yakobson; Kevin F. McCarty; Philip Kim; James Hone; Luigi Colombo; Rodney S. Ruoff
Publication Date
2016-05
Journal
NATURE NANOTECHNOLOGY, v.11, no.5, pp.426 - 431
Publisher
NATURE PUBLISHING GROUP
Abstract
Bernal (AB)-stacked bilayer graphene (BLG) is a semiconductor whose bandgap can be tuned by a transverse electric field, making it a unique material for a number of electronic and photonic devices(1-3). A scalable approach to synthesize high-quality BLG is therefore critical, which requires minimal crystalline defects in both graphene layers(4,5) and maximal area of Bernal stacking, which is necessary for bandgap tunability(6). Here we demonstrate that in an oxygen-activated chemical vapour deposition (CVD) process, half-millimetre size, Bernal-stacked BLG single crystals can be synthesized on Cu. Besides the traditional 'surface-limited' growth mechanism for SLG (1st layer), we discovered new microscopic steps governing the growth of the 2nd graphene layer below the 1st layer as the diffusion of carbon atoms through the Cu bulk after complete dehydrogenation of hydrocarbon molecules on the Cu surface, which does not occur in the absence of oxygen. Moreover, we found that the efficient diffusion of the carbon atoms present at the interface between Cu and the 1st graphene layer further facilitates growth of large domains of the 2nd layer. The CVD BLG has superior electrical quality, with a device on/off ratio greater than 10(4), and a tunable bandgap up to similar to 100 meV at a displacement field of 0.9 V nm(-1). © 2016 Macmillan Publishers Limited. All rights reserved
URI
https://pr.ibs.re.kr/handle/8788114/2708
ISSN
1748-3387
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
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