Charge localisation on a redox-active single molecule junction and its influence on coherent electron transport

Abstract

For adjusting the charging state of a molecular metal complex in the context of a density functional theory description of coherent electron transport through single molecule junctions, we correct for self interaction effects by fixing the charge on a counterion, which in our calculations mimics the effect of the gate in an electrochemical STM setup, with two competing methods, namely the generalized $\Delta$ SCF technique and screening with solvation shells. One would expect a transmission peak to be pinned at the Fermi energy for a nominal charge of +1 on the molecule in the junction but we find a more complex situation in this multicomponent system defined by the complex, the leads, the counterion and the solvent. In particular equilibrium charge transfer between the molecule and the leads plays an importanty role, which we investigate in dependence on the total external charge in the context of electronegativity theory.

References in corpus (4)

• Delta Self-Consistent Field as a method to obtain potential energy surfaces of excited molecules on surfaces
• Fermi level alignment in molecular nanojunctions and its relation to charge transfer
• Hot electron mediated desorption rates calculated from excited state potential energy surfaces
• Electron transfer through a single barrier inside a molecule: from strong to weak coupling

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