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

2008/07/26 by P. G. Piva, Paul G. Piva, Robert A. Wolkow +1 · 3 citations
Engineering · Physics and Astronomy · #Force Microscopy Techniques and Applications #Molecular Junctions and Nanostructures #Surface Chemistry and Catalysis #cond-mat.mes-hall #cond-mat.mtrl-sci

paper · pdf · doi:10.1103/physrevlett.101.106801

4 pages, 4 figures. To be published in Physical Review Letters

arxiv created 2008/07/26 · openalex publication_date 2008/09/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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\mathrm\text\ensuremath-styrene/OCH₃\mathrm\text\ensuremath-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.

Citations

• Long-Range Repulsive Interaction between Molecules on a Metal Surface Induced by Charge Transfer

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