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Wells JW, Kallehauge JF, Hansen TM, et al. Disentangling surface, bulk, and space-charge-layer conductivity in Si(111)-(7 x 7). Phys Rev Lett. 2006;97(20):206803doi: 10.1103/PhysRevLett.97.206803.
Wells, J. W., Kallehauge, J. F., Hansen, T. M., & Hofmann, P. (2006). Disentangling surface, bulk, and space-charge-layer conductivity in Si(111)-(7 x 7). Physical review letters, 97(20), 206803. https://doi.org/10.1103/PhysRevLett.97.206803
Wells, J W, et al. "Disentangling surface, bulk, and space-charge-layer conductivity in Si(111)-(7 x 7)." Physical review letters vol. 97,20 (2006): 206803. doi: https://doi.org/10.1103/PhysRevLett.97.206803
Wells JW, Kallehauge JF, Hansen TM, Hofmann P. Disentangling surface, bulk, and space-charge-layer conductivity in Si(111)-(7 x 7). Phys Rev Lett. 2006 Nov 17;97(20):206803. doi: 10.1103/PhysRevLett.97.206803. Epub 2006 Nov 13. PMID: 17155703.
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Phys Rev Lett. 2006 Nov 17;97(20):206803. doi: 10.1103/PhysRevLett.97.206803. Epub 2006 Nov 13.

Disentangling surface, bulk, and space-charge-layer conductivity in Si(111)-(7 x 7).

Physical review letters

J W Wells, J F Kallehauge, T M Hansen, Ph Hofmann

Affiliations

  1. Institute for Storage Ring Facilities and Interdisciplinary Nanoscience Center (iNANO), University of Aarhus, 8000 Aarhus C, Denmark. [email protected]

PMID: 17155703 DOI: 10.1103/PhysRevLett.97.206803

Abstract

A novel approach for extracting genuine surface conductivities is presented and illustrated using the unresolved example of Si(111)-(7 x 7). Its temperature-dependent conductivity was measured with a microscopic four point probe between room temperature and 100 K. At room temperature the measured conductance corresponds to that expected from the bulk doping level. However, as the temperatures is lowered below approximately 200 K, the conductance decreases by several orders of magnitude in a small temperature range and it saturates at a low temperature value of approximately 4 x 10(-8) Omega(-1), irrespective of bulk doping. This abrupt transition is interpreted as the switching from bulk to surface conduction, an interpretation which is supported by a numerical model for the measured four point probe conductance. The value of the surface conductance is considerably lower than that of a good metal.

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