Journal
NANO LETTERS
Volume 17, Issue 2, Pages 1161-1166Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b04804
Keywords
-
Categories
Funding
- National Key Research & Development Projects of China [2016YFA0202300]
- MOST [2013CBA01600]
- National Natural Science Foundation of China [61390501, 51210003, 11604373, 51572290, 51325204]
- CAS Pioneer Hundred Talents Program
- U.S. Department of Energy [DE-FG02-09ER46554]
- McMinn Endowment
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- Extreme Science and Engineering Discovery Environment (XSEDE) - National Science Foundation [ACI-1053575]
Ask authors/readers for more resources
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 stnictures 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available