"Spectroscopic characterization of a single dangling bond on a bare Si(100)-c(4×2) surface for n- and p-type doping"
![Thumbnail](/themes/edepositireland/images/white_rectangle.jpeg)
File Type:
PDFItem Type:
Journal ArticleDate:
2012Citation:
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 035318Download Item:
Abstract:
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.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
G20348
Author's Homepage:
http://people.tcd.ie/sanvitoshttp://people.tcd.ie/naydenob
http://people.tcd.ie/jboland
Description:
PUBLISHEDArticle No: 035318
Sponsor:
Science Foundation Ireland (SFI)Type of material:
Journal ArticleCollections
Series/Report no:
Physical Review B86
3
Availability:
Full text availableKeywords:
phase shift fingerprintSubject (TCD):
Nanoscience & Materials , Surface scienceDOI:
http://dx.doi.org/ 10.1103/PhysRevB.86.035318Metadata
Show full item recordLicences: