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  • Title: Dipole tuning of charge transport in molecular junctions.
    Author: Hiremath RK, Rabinal MH, Mulimani BG.
    Journal: Phys Chem Chem Phys; 2010 Mar 20; 12(11):2564-8. PubMed ID: 20200732.
    Abstract:
    Molecules with different magnitude and direction of dipole moments are sandwiched between mercury (Hg) and p(+)-Si to form Hg-molecules-(p(+)) Si junctions. The importance of the dipole moment of molecules in controlling the symmetry of current-voltage curves is shown by carrying out charge transport measurements at these molecular junctions. Junction parameters are obtained by considering charge transport across the junction as a combination of tunneling and Schottky emission. An interesting effect due to dipole reversal resulting in rectification of junction curves in the opposite quadrants of the current-voltage axis is observed and analyzed. The junction curves also exhibit a different degree of rectification with increasing magnitude of the dipole moment of the sandwiched molecules.
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