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Anisotropic Synthesis of Armchair Graphene Nanoribbon Arrays from Sub-5 nm Seeds at Variable Pitches on Germanium

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [2];  [2];  [2];  [2];  [2];  [2]
  1. Univ. of Wisconsin, Madison, WI (United States); University of Wisconsin-Madison Department of Materials Science and Engineering
  2. Univ. of Wisconsin, Madison, WI (United States)
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At widths below 10 nm, armchair graphene nanoribbons become semiconductors. One interesting route to synthesize nanoribbons is chemical vapor deposition (CVD) of hydrocarbons on Ge(001), and synthesis from seeds reduces nanoribbon polydispersity. In this contribution, we advance the seed-initiated synthesis of nanoribbons and explore the impact of seed size and nanoribbon spacing on growth kinetics. Periodic arrays of graphene seeds are lithographically patterned and etched to reduce their diameter. The viability of initiating synthesis from sub-5 nm seeds is demonstrated, and the pitch between nanoribbons is reduced from 500 to 50 nm to show that crowding effects do not perturb nanoribbon growth kinetics. The invariance of kinetics with pitch in combination with density functional theory (DFT) calculations suggest that (1) the growth species for synthesis has a diffusion length of ≪50 nm and/or (2) the kinetics are strongly attachment-limited. These results demonstrate that seed-initiated synthesis on Ge(001) is a promising path for creating dense arrays of armchair graphene nanoribbons for semiconductor electronics applications.
Research Organization:
Univ. of Wisconsin, Madison, WI (United States); Univ. of California, Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)
Contributing Organization:
National Energy Research Scientific Computing Center (NERSC)
Grant/Contract Number:
SC0016007; FG02-05ER15731; AC02-05CH11231
OSTI ID:
1616950
Journal Information:
Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 15 Vol. 10; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

Figures / Tables (4)

Figure 1(p. 6)figure Figure 1
Figure 2(p. 8)figure Figure 2
Figure 3(p. 9)figure Figure 3
Figure 4(p. 13)figure Figure 4

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY