Molecular rectifiers, analogy with

Molecular rectifiers. The effect of partitioning different redox molecules to opposite sides of an interface is to produce particles or devices whose function is mimetic of semiconductor-based devices. Figure 1 illustrates the analogy between a p-n junction device (a diode or photodiode) and a bimolecular rectifier". At the p-n junction, there is a built-in electrical potential drop which determines which way current can flow. By applying a bias which partially cancels the built in potential, electrons flow readily from left to right. The opposite bias reinforces the built-in potential, and allows no current to flow. In the analogous molecular system, the direction of rapid electron transfer is from the molecule with the more negative redox potential to the more positive one. In this case, it is not a built-in electric field (or... 

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