Abstract
On-surface polymerization is used to produce conjugated molecular wires that are relevant for future optoelectronic devices based on a single molecule as active components. To this end, a scanning tunneling microscopy (STM) approach is chosen as it can image the on-surface synthesized wires and characterize their electronic structure with atomic-scale precision. More importantly, the STM tip can be used to progressively lift individual molecular wires between the tip and the metallic substrate of the STM while simultaneously recording the current traversing the wire junction. In a single measurement, it is therefore possible to characterize the transport properties of a wire as continuous function of its length but also to determine the effect of mechanical stresses on the wire's properties. This lifted configuration is also particularly well suited for electroluminescent measurements where the electronic current traversing the junction excites the intrinsic fluorescence of the suspended wire. In this way, prototypical single-molecule light-emitting devices were produced whose emission color and linewidth can be controlled by a rational choice of the initial chemical components.
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