Communication: Oriented diode-like molecules in a polymer binder are the new approach described here for overcoming the problems associated with Schottky and p-n junctions in semiconductor devices. The principle relies on the intrinsic polar nature of the organic molecules used-which causes them to orient in an applied static electric field-and is expected to improve significantly the efficiency of polymeric semiconductor devices The principle is outlined and experimental evidence presented for molecular rectification equivalent to a distributed p-n homojunction.