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Tuning the band gap in silicene by oxidation
Yi Du1, Jincheng Zhuang, Hongsheng Liu
1Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong , Wollongong, New South Wales 2525, Australia.
ACS Nano
|September 24, 2014
Summary
Oxygen adatoms tune the electronic properties of silicene, transforming it from semimetallic to semiconducting. This band gap engineering is crucial for developing novel two-dimensional electronic materials beyond graphene oxide.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Surface Science
Background:
- Silicene, a silicon analogue of graphene, exhibits unique electronic properties.
- Controlling silicene's band gap is essential for its application in electronic devices.
- Graphene oxide has limitations in achieving specific electronic properties.
Purpose of the Study:
- To investigate the effect of oxygen adatoms on the electronic band gap of silicene.
- To explore the tunability of silicene's electronic properties for device applications.
- To compare the potential of oxygenated silicene with graphene oxide.
Main Methods:
- Low-temperature scanning tunneling microscopy (STM) to observe adsorption configurations.
- In situ Raman spectroscopy to analyze chemical bonding.
- First-principles calculations to verify energy favorability and structural stability.
Main Results:
- Oxygen adatoms create tunable band gaps in silicene, shifting it from semimetallic to semiconducting.
- Adsorption configuration and amount of oxygen are critical for band gap engineering.
- Si-O-Si bonds are the most stable species formed on various silicene structures (√13 × √13, 4 × 4, 2√3 × 2√3).
- Silicene monolayers maintain structural integrity even when fully covered by oxygen.
Conclusions:
- Oxygen adatoms provide a viable method for tuning silicene's band gap.
- Oxygenated silicene offers a promising alternative to graphene oxide for advanced 2D electronic materials.
- This work expands the range of tunable two-dimensional electronic materials for novel device functionalities.
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