Charge transport through perylene bisimide molecular junctions: An electrochemical approach

Li, Chen; Stepanenko, Vladimir; Lin, Mei-Jin; Hong, Wenjing; Würthner, Frank; Wandlowski, Thomas (2013). Charge transport through perylene bisimide molecular junctions: An electrochemical approach. Physica status solidi. B - basic solid state physics, 250(11), pp. 2458-2467. Wiley-VCH 10.1002/pssb.201350034

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Single molecular junction conductances of a family of five symmetric and two unsymmetric perylene tetracarboxylic bisimides (PBI) with variable bay-area substituents were studied employing a scanning tunneling microscope (STM)-based break junction technique. The stretching experiments provide clear evidence for the formation of single molecular junctions and π–π stacked dimers. Electrolyte gating demonstrates a distinct gating effect in symmetric molecular junctions, which strongly depends on molecular structure and properties of the solvent/electrolyte. Weak π–π-coupling in the unsymmetric dimers prevents rectification.

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