Self-assembled molecular corrals on a semiconductor surface

Reference:

Dobrin, S., Harikumar, K., Jones, R., Li, N., McNab, I., Polanyi, J., Sloan, P., Waqar, Z., Yang, J., Ayissi, S. and Hofer, W. A., 2006. Self-assembled molecular corrals on a semiconductor surface. Surface Science, 600 (5), pp. 43-47.

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Official URL:

http://dx.doi.org/10.1016/j.susc.2005.12.044

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(111)-(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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