Ionically-assembled structures that comprise discrete layers of cationic acceptors (4,4′-bipyridinium) and anionic donors (copper phthalocyanine-3,4′,4″,4‴-tetrasulfonate) exhibit asymmetric current–voltage (I–V) characteristics with high rectification ratios of 60–100 at ±1 V.
G. J. Ashwell, J. Ewington and B. J. Robinson, Chem. Commun., 2006, 618 DOI: 10.1039/B515897D
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