The silicon counterpart of graphene, the so called "silicene", has been so far a fascinating theoretical hypothesis, but only recent efforts have pushed it to concrete evidence thus triggering a tremendous interest in silicene for electronic applications and fundamental investigations. Indeed, in addition to graphene, silicene is expected to provide an intimate affinity with the Si-based technology but, unlike graphene, the silicene appears as a buckled lattice where various superstructures take place depending on the periodic distribution of buckled bonds. Here we elucidate the atomistic details of the 4×4 and √13 × √13 silicene superstructures epitaxially grown on Ag(111) substrates. These silicene layers have been successfully encapsulated with Al2O3in order to access ex situ Raman spectroscopy. The Raman spectrum of the encapsulated silicene has been self-consistently interpreted upon comparison with ab initio calculated spectra. In addition to the presence of the double degenerate E2gmode, typical for honeycomb lattices, the non-uniform bond length and the non-symmetric buckling in the silicene layer introduce an intrinsic disorder which gives rise to disorder activated Raman extra-peaks. © The Electrochemical Society.

Molle, A., Chiappe, D., Cinquanta, E., Grazianetti, C., Fanciulli, M., Scalise, E., et al. (2013). Structural and chemical stabilization of the epitaxial silicene. ECS TRANSACTIONS, 58(7), 217-227 [10.1149/05807.0217ecst].

Structural and chemical stabilization of the epitaxial silicene

Cinquanta E.;Grazianetti C.;Fanciulli M.;Scalise E.;
2013

Abstract

The silicon counterpart of graphene, the so called "silicene", has been so far a fascinating theoretical hypothesis, but only recent efforts have pushed it to concrete evidence thus triggering a tremendous interest in silicene for electronic applications and fundamental investigations. Indeed, in addition to graphene, silicene is expected to provide an intimate affinity with the Si-based technology but, unlike graphene, the silicene appears as a buckled lattice where various superstructures take place depending on the periodic distribution of buckled bonds. Here we elucidate the atomistic details of the 4×4 and √13 × √13 silicene superstructures epitaxially grown on Ag(111) substrates. These silicene layers have been successfully encapsulated with Al2O3in order to access ex situ Raman spectroscopy. The Raman spectrum of the encapsulated silicene has been self-consistently interpreted upon comparison with ab initio calculated spectra. In addition to the presence of the double degenerate E2gmode, typical for honeycomb lattices, the non-uniform bond length and the non-symmetric buckling in the silicene layer introduce an intrinsic disorder which gives rise to disorder activated Raman extra-peaks. © The Electrochemical Society.
Editoriale, introduzione, contributo a forum/dibattito
Silicene, epitaxy, DFT, 2D materials
English
2013
58
7
217
227
none
Molle, A., Chiappe, D., Cinquanta, E., Grazianetti, C., Fanciulli, M., Scalise, E., et al. (2013). Structural and chemical stabilization of the epitaxial silicene. ECS TRANSACTIONS, 58(7), 217-227 [10.1149/05807.0217ecst].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/241745
Citazioni
  • Scopus 5
  • ???jsp.display-item.citation.isi??? 5
Social impact