Self-assembled molecular corrals on a semiconductor surface |
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Authors: | S Dobrin RV Jones N Li IR McNab PA Sloan J Yang WA Hofer |
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Institution: | a Department of Chemistry and Institute of Optical Sciences, University of Toronto, 80 St. George Street, Toronto, Ont., Canada M5S 3H6 b Surface Science Research Centre, The University of Liverpool, Liverpool L69 3BX, UK |
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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. |
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