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Tuning the band gap in silicene by oxidation

Journal Article


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Abstract


  • Silicene monolayers grown on Ag(111) surfaces demonstrate a band gap that is tunable by oxygen adatoms from semimetallic to semiconducting type. With the use of low-temperature scanning tunneling microscopy, we find that the adsorption configurations and amounts of oxygen adatoms on the silicene surface are critical for band gap engineering, which is dominated by different buckled structures in √13 × √13, 4 × 4, and 2√3 × 2√3 silicene layers. The Si–O–Si bonds are the most energy-favored species formed on √13 × √13, 4 × 4, and 2√3 × 2√3 structures under oxidation, which is verified by in situ Raman spectroscopy as well as first-principles calculations. The silicene monolayers retain their structures when fully covered by oxygen adatoms. Our work demonstrates the feasibility of tuning the band gap of silicene with oxygen adatoms, which, in turn, expands the base of available two-dimensional electronic materials for devices with properties that is hardly achieved with graphene oxide.

Authors


  •   Du, Yi
  •   Zhuang, Jincheng (external author)
  •   Liu, Hongsheng (external author)
  •   Xu, Xun
  •   Eilers, Stefan (external author)
  •   Wu, Kehui (external author)
  •   Cheng, Peng (external author)
  •   Zhao, Jijun (external author)
  •   Pi, Xiaodong (external author)
  •   See, Khay W.
  •   Peleckis, Germanas
  •   Wang, Xiaolin
  •   Dou, Shi Xue

Publication Date


  • 2014

Citation


  • Du, Y., Zhuang, J., Liu, H., Xu, X., Eilers, S., Wu, K., Cheng, P., Zhao, J., Pi, X., See, K., Peleckis, G., Wang, X. & Dou, S. Xue. (2014). Tuning the band gap in silicene by oxidation. ACS Nano, 8 (10), 10019-10025.

Scopus Eid


  • 2-s2.0-84908423983

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2270&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1269

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 10019

End Page


  • 10025

Volume


  • 8

Issue


  • 10

Place Of Publication


  • United States

Abstract


  • Silicene monolayers grown on Ag(111) surfaces demonstrate a band gap that is tunable by oxygen adatoms from semimetallic to semiconducting type. With the use of low-temperature scanning tunneling microscopy, we find that the adsorption configurations and amounts of oxygen adatoms on the silicene surface are critical for band gap engineering, which is dominated by different buckled structures in √13 × √13, 4 × 4, and 2√3 × 2√3 silicene layers. The Si–O–Si bonds are the most energy-favored species formed on √13 × √13, 4 × 4, and 2√3 × 2√3 structures under oxidation, which is verified by in situ Raman spectroscopy as well as first-principles calculations. The silicene monolayers retain their structures when fully covered by oxygen adatoms. Our work demonstrates the feasibility of tuning the band gap of silicene with oxygen adatoms, which, in turn, expands the base of available two-dimensional electronic materials for devices with properties that is hardly achieved with graphene oxide.

Authors


  •   Du, Yi
  •   Zhuang, Jincheng (external author)
  •   Liu, Hongsheng (external author)
  •   Xu, Xun
  •   Eilers, Stefan (external author)
  •   Wu, Kehui (external author)
  •   Cheng, Peng (external author)
  •   Zhao, Jijun (external author)
  •   Pi, Xiaodong (external author)
  •   See, Khay W.
  •   Peleckis, Germanas
  •   Wang, Xiaolin
  •   Dou, Shi Xue

Publication Date


  • 2014

Citation


  • Du, Y., Zhuang, J., Liu, H., Xu, X., Eilers, S., Wu, K., Cheng, P., Zhao, J., Pi, X., See, K., Peleckis, G., Wang, X. & Dou, S. Xue. (2014). Tuning the band gap in silicene by oxidation. ACS Nano, 8 (10), 10019-10025.

Scopus Eid


  • 2-s2.0-84908423983

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2270&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1269

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 10019

End Page


  • 10025

Volume


  • 8

Issue


  • 10

Place Of Publication


  • United States