Monolayer-to-bilayer transformation of silicenes and their structural analysis
| Autor: | Tetsu Ohsuna, Tetsuya Morishita, Hideyuki Nakano, Michelle J. S. Spencer, Ritsuko Yaokawa, Yuichiro Hayasaka |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Fabrication Silicon Band gap Science General Physics and Astronomy chemistry.chemical_element Nanotechnology 02 engineering and technology 01 natural sciences General Biochemistry Genetics and Molecular Biology Article law.invention law 0103 physical sciences Monolayer 010302 applied physics Multidisciplinary business.industry Graphene Silicene Bilayer General Chemistry 021001 nanoscience & nanotechnology Semiconductor chemistry 0210 nano-technology business |
| Zdroj: | Nature Communications, Vol 7, Iss 1, Pp 1-6 (2016) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | 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. Two dimensional forms of silicon offer different conductive properties to that of the bulk material, promising applications in new electronic technologies. Here, the authors report the fabrication of bilayer silicenes which, unlike their monolayer form, are indirect bandgap semiconductors. |
| Databáze: | OpenAIRE |
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