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Phys. Rev. Lett. 101, 106801 (2008) [4 pages]

Nonlocal Conductance Modulation by Molecules: Scanning Tunneling Microscopy of Substituted Styrene Heterostructures on H-Terminated Si(100)

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Paul G. Piva1,*, Robert A. Wolkow1, and George Kirczenow2
1National Institute for Nanotechnology, National Research Council of Canada, Edmonton, Alberta T6G 2V4, Canada, and Department of Physics, University of Alberta, Edmonton, Alberta T6G 2J1, Canada
2Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada

Received 10 June 2008; published 2 September 2008

One-dimensional organic heterostructures consisting of contiguous lines of CF3- and OCH3-substituted styrene molecules on silicon are studied by scanning tunneling microscopy and ab initio simulation. Dipole fields of OCH3-styrene molecules are found to enhance conduction through molecules near CF3-styrene/OCH3-styrene heterojunctions. Those of CF3-styrene depress transport through the nearby silicon. Thus the choice of substituents and their attachment site on host molecules provide a means of differentially tuning molecule and substrate transport at the molecular scale.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.106801
DOI:
10.1103/PhysRevLett.101.106801
PACS:
73.63.−b, 31.70.−f, 68.37.Ef, 68.43.−h

*Present address: Institute for National Measurement Standards, NRC, Ottawa, Ontario K1A 0R6, Canada.

 
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