Author/Authors :
Dobrin، نويسنده , , S. and Harikumar، نويسنده , , K.R. and Jones، نويسنده , , Adriano R.V. and Li، نويسنده , , N. and McNab، نويسنده , , I.R. and Polanyi، نويسنده , , J.C. and Sloan، نويسنده , , P.A. and Waqar، نويسنده , , Z. and Yang، نويسنده , , J.(S.Y.) and Ayissi، نويسنده , , S. and Hofer، نويسنده , , W.A.، نويسنده ,
Abstract :
Nano-corrals for capturing surface electrons are of interest in molecular electronics. Here we show that haloalkane molecules, e.g., 1-chlorododecane, physisorbed on Si(1 1 1)-(7 × 7) self-assemble to form dimers stable to 100 °C which corral silicon adatoms. Corral size is shown to be governed by the haloalkane chain-length. Spectroscopic and theoretical evidence shows that the haloalkane dimer induces electron transfer to the corralled adatom, shifting its energy levels by ∼1 eV. Isolation of a labile pre-cursor points to a model for corral formation which combines mobility with immobility; monomers diffusing in a mobile vertical state meet and convert to the immobile horizontal dimers constituting the corrals.
