Current-voltage characteristics with a step structure of metal/polyimide/rhodamine-dendrimer/polyimide/metal junction

we examined the current-voltage (I-V) characteristic of metal/polyimide/rho damine-dendorimer/metal junctions prepared by the Langmuir-Blodgett (LB) te chnique. At a temperature of 32.8 K, a step structure was observed in the I -V characteristic, whereas it was not observed for the junctions without rh odamine-dendorimer. The step structure was very similar to that seen in so- called Coulomb staircase. On the basis of the model of Coulomb blockade, th e possibility of single electron tunneling via rhodamine-dendrimer (Rh-G2) molecule as a quantum dot was discussed.