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The structural and electronic properties of nanoscale Si epitaxially grown on Ag(111) can be tuned from a multilayer silicene phase, where the constitutive layers incorporate a mixed sp2/sp3 bonding, to other ordinary Si phases, such as amorphous and diamond-like Si. Based on comparative scanning tunneling microscopy and Raman spectroscopy investigations, a key role in determining the nanoscale Si phase is played by the growth temperature of the epitaxial deposition on Ag(111) substrate and the presence or absence of a single-layer silicene as a seed for the successive growth. Furthermore, when integrated into a field-effect transistor device, multilayer silicene exhibits a characteristic ambipolar charge carrier transport behavior that makes it strikingly different from other conventional Si channels and suggestive of a Dirac-like character of the electronic bands of the crystal. These findings spotlight the …
American Chemical Society
Publication date: 
10 Mar 2017

Carlo Grazianetti, Eugenio Cinquanta, Li Tao, Paola De Padova, Claudio Quaresima, Carlo Ottaviani, Deji Akinwande, Alessandro Molle

Biblio References: 
Volume: 11 Issue: 3 Pages: 3376-3382
ACS nano