"Spectroscopic characterization of a single dangling bond on a bare Si(100)-c(4×2) surface for n- and p-type doping"
Item Type:Journal Article
Citation:M. Mantega, I. Rungger, B. Naydenov, J. J. Boland and S. Sanvito, "Spectroscopic characterization of a single dangling bond on a bare Si(100)-c(4×2) surface for n- and p-type doping", Physical Review B, 86, 3, 2012, Article No 035318
PhysRevB.86.035318.pdf (Published (publisher's copy) - Peer Reviewed) 1.428Mb
We investigate the charging state of an isolated single dangling bond formed on an unpassivated Si(100) surface with c(4?2) reconstruction, by comparing scanning tunneling microscopy and spectroscopy analysis with density functional theory calculations. The dangling bond is created by placing a single hydrogen atom on the bare surface with the tip of a scanning tunneling microscope. The H atom passivates one of the dimer dangling bonds responsible for the surface one-dimensional electronic structure. This leaves a second dangling at the reacted surface dimer which breaks the surface periodicity. We consider two possible H adsorption configurations for both the neutral and the doped situation (n- and p-type). In the case of n-doping we find that the single dangling bond state is doubly occupied and the most stable configuration is that with H bonded to the bottom Si atom of the surface dimer. In the case of p-doping the dangling bond is instead empty and the configuration with the H attached to the top atom of the dimer is the most stable. Importantly the two configurations have different scattering properties and phase shift fingerprints. This might open up interesting perspectives for fabricating a switching device by tuning the doping level or by locally charging the single dangling bond state.
Science Foundation Ireland (SFI)
Article No: 035318
Type of material:Journal Article
Series/Report no:Physical Review B
Availability:Full text available
Keywords:phase shift fingerprint