Abstract
A simple organic diode structure has been made based on N,N′-bis(naphthalen-1-yl)-N,N′-bis(phenyl)-benzidine (NPB)/Fullerene (C60) heterojunction. Ultraviolet photoelectron spectroscopy measurements show an energy level alignment at the heterojunction as such that no potential barrier near this heterojunction to hinder the formation of charge transfer excitons, which recombines at a very fast rate. This fast exciton recombination at this heterojunction makes NPB/C60 behave like an ideal Ohmic contact and thus leads to an extremely high 7.8×104 rectifying ratio from the electrode/organic contacts.
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