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

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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.
    JST Presto)

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.

Suggested Citation

  • Ritsuko Yaokawa & Tetsu Ohsuna & Tetsuya Morishita & Yuichiro Hayasaka & Michelle J. S. Spencer & Hideyuki Nakano, 2016. "Monolayer-to-bilayer transformation of silicenes and their structural analysis," Nature Communications, Nature, vol. 7(1), pages 1-6, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10657
    DOI: 10.1038/ncomms10657
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