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Title: Sequence of Silicon Monolayer Structures Grown on a Ru Surface: from a Herringbone Structure to Silicene

Journal Article · · Nano Letters
 [1];  [2];  [3];  [4];  [4];  [4];  [4];  [5];  [6]; ORCiD logo [5];  [3];  [5]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Chemistry, Inst. of Physics, Beijing Key Lab. for Nanomaterials and Nanodevices
  2. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics, Beijing Key Lab. for Nanomaterials and Nanodevices; Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy and Dept. of Electrical Engineering and Computer Science
  3. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics, Beijing Key Lab. for Nanomaterials and Nanodevices; Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy and Dept. of Electrical Engineering and Computer Science
  4. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics, Beijing Key Lab. for Nanomaterials and Nanodevices
  5. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics, Beijing Key Lab. for Nanomaterials and Nanodevices, School of Physical Sciences and Key Lab. of Vacuum Physics
  6. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Chemistry

Silicon-based two-dimensional (2D) materials are uniquely suited for integration in Si-based electronics. Silicene, an analogue of graphene, was recently fabricated on several substrates and was used to make a field-effect transistor. Here, we report that when Ru(0001) is used as a substrate, a range of distinct monolayer silicon structures forms, evolving toward silicene with increasing Si coverage. Low Si coverage produces a herringbone structure, a hitherto undiscovered 2D phase of silicon. With increasing Si coverage, herringbone elbows evolve into silicene-like honeycomb stripes under tension, resulting in a herringbone-honeycomb 2D superlattice. At even higher coverage, the honeycomb stripes widen and merge coherently to form silicene in registry with the substrate. Scanning tunneling microscopy (STM) was used to image the structures. The structural stability and electronic properties of the Si 2D structures, the interaction between the Si 2D structures and the Ru substrate, and the evolution of the distinct monolayer Si structures were elucidated by density functional theory (DFT) calculations. This work paves the way for further investigations of monolayer Si structures, the corresponding growth mechanisms, and possible functionalization by impurities.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Vanderbilt Univ., Nashville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-09ER46554; AC02-05CH11231
OSTI ID:
1484379
Alternate ID(s):
OSTI ID: 1597815
Journal Information:
Nano Letters, Vol. 17, Issue 2; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 76 works
Citation information provided by
Web of Science

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Cited By (12)

Group-IV 2D materials beyond graphene on nonmetal substrates: Challenges, recent progress, and future perspectives journal December 2019
Electronic Band Engineering in Elemental 2D Materials journal August 2018
Quantitative determination of atomic buckling of silicene by atomic force microscopy journal December 2019
Functionalization of group-14 two-dimensional materials journal May 2018
Planar Silicene: A New Silicon Allotrope Epitaxially Grown by Segregation journal September 2019
Substrate-induced magnetism and topological phase transition in silicene journal January 2018
2D Crystal–Based Fibers: Status and Challenges journal August 2019
Epitaxial growth and physical properties of 2D materials beyond graphene: from monatomic materials to binary compounds journal January 2018
The adsorption of silicon on an iridium surface ruling out silicene growth journal January 2018
Two-dimensional antiferromagnetic boron form first principles journal May 2019
Moiré‐Potential‐Induced Band Structure Engineering in Graphene and Silicene journal September 2019
Transport and Photoelectric Properties of 2D Silicene/MX2 (M = Mo, W; X = S, Se) Heterostructures journal October 2018

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