Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 73, Issue -, Pages 21-26Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physe.2015.05.014
Keywords
Silicene; Asymmetrical functionalization; OFT; Janus materials
Funding
- National Nature Science Foundation of China [21203048]
- Scientific Research Fund of Heilongjiang Provincial Education Department [12531195]
- Excellent Young Foundation of Harbin Normal University [XKYQ201304]
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Recent studies have suggested that chemical functionalization is a promising avenue to tailor the band gap of silicene, which plays an important role on widening its application. Here, we propose a new route to functionalize silicene, that is asymmetrically modification of silicene (Janus silicene or X-silicene-Y), which is produced by co-grafting of two different groups (X and Y) on both sides of silicene. By performing density functional theory (OFT) calculations, we demonstrate the stability and electronic properties of X-silicene-Y sheets. The results indicate that chemical functionalization on one side can greatly enhance the chemical reactivity of the opposite side, suggesting the communication between the two adsorbed groups and enhancing the stability of the hybrids. Compared to the pristine silicene with a zero band gap, X-silicene-Y sheets exhibit semiconducting nature with a non-zero band gap, which is dependent on the coverage of X/Y. Our results provide a novel and effective method to engineer the band gap of silicene, which would be useful to design novel silicene-based devices with multiple functions. (C) 2015 Elsevier B.V. All rights reserved.
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