Abstract
Interfacial layers in metal-polymer-metal structures have been investigated. Analysis by X-ray photoelectron spectroscopy (X.p.s.) at room temperature of the changes in various core electron spectra associated with the polymer film and the overlayers shows that there is formation of metal oxide-carbide species in the polymer-metal interface in the system obtained by deposition of metal on poly(phenylene vinylene) (PPV) polymer. In contrast, for the system in which metal is deposited on the PPV precursor, no complex species are observed after the transformation of precursor into PPV by heat treatment. This difference can be explained by the side-reactions of the under-products generated during the pyrolysis of the precursor into the polymer. Finally, the role of the interfacial complex species in the origin and in the mechanism of the rectifying contacts observed in the metal-polymer-metal structures is also discussed.
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