Monolayer-to-bilayer transformation of silicenes and their structural analysis

Ritsuko Yaokawa (), Tetsu Ohsuna, Tetsuya Morishita, Yuichiro Hayasaka, Michelle J. S. Spencer and Hideyuki Nakano ()
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Ritsuko Yaokawa: TOYOTA Central R&D Labs, Inc.
Tetsu Ohsuna: TOYOTA Central R&D Labs, Inc.
Tetsuya Morishita: CD-FMat, National Institute of Advanced Industrial Science and Technology (AIST)
Yuichiro Hayasaka: The Electron Microscopy Center, Tohoku University
Michelle J. S. Spencer: School of Science, RMIT University
Hideyuki Nakano: TOYOTA Central R&D Labs, Inc.

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Silicene, a two-dimensional honeycomb network of silicon atoms like graphene, holds great potential as a key material in the next generation of electronics; however, its use in more demanding applications is prevented because of its instability under ambient conditions. Here we report three types of bilayer silicenes that form after treating calcium-intercalated monolayer silicene (CaSi2) with a BF4− -based ionic liquid. The bilayer silicenes that are obtained are sandwiched between planar crystals of CaF2 and/or CaSi2, with one of the bilayer silicenes being a new allotrope of silicon, containing four-, five- and six-membered sp3 silicon rings. The number of unsaturated silicon bonds in the structure is reduced compared with monolayer silicene. Additionally, the bandgap opens to 1.08 eV and is indirect; this is in contrast to monolayer silicene which is a zero-gap semiconductor.

Date: 2016
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DOI: 10.1038/ncomms10657

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