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(Color online) (a) Schematics of the molecular circuit design. The Au hemisphere of the particle and the electrodes are coated with a chemisorbed C12 or AZO SAMs. (b) Scanning electron microscopy view of 1 µm diameter microsphere trapped over an 80 nm trench. The top left sphere contrast reveals the partial Ni/Au coverage of the spheres. (c) Cartoon of the interaction between molecules in the specific device geometry used. (c) The cis-trans isomerization of the thiol terminated biphenyl azobenzene molecule.
(Color online) IV curves showing reversible optically modulated current switching in the junction. Curve 1 corresponds to initial junctions, expected to correspond to molecules in trans configuration. Curve 2 results from UV (365 nm) irradiation, of enhanced conductance due to the occurrence of cis configurations. Curve 3, after 455 nm illumination, illustrates the reversibility of the switching, similarly to curve 4, switching again to cis after re-illumination with UV.
(Color online) Example of the time evolution of a junction conductance under UV illumination. The functionalized electrodes have a low-current leakage curve (dotted line), with significant increase after trapping functionalized spheres (full line). The other curves show increasing conductivity under increasing indicated illumination time. The inset shows the evolution of the on/off sample resistance after successive UV-visible light illuminations, revealing multiple possible switching events.
Statistics of the number of fabricated samples. The type of junction indicates the molecules assembled on the sphere and the electrodes, respectively. The third column counts the number of selected devices after microspheres trapping. The fourth column counts high-currents samples indicating metal shorts.
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