INTERFACE FORMATION OF CA WITH POLY(P-PHENYLENE VINYLENE)

We have investigated the interface formation of Ca with poly(p-phenyle ne vinylene) (PPV) using x-ray photoemission spectroscopy. The most si gnificant part of our findings was the very late occurrence of band be nding at the Ca/PPV interface and the lack of strong reaction between the Ca overlayer with the PPV substrate, indicating that the Schottky barrier formation in Ca/PPV was a slow process. The late barrier forma tion at the Ca/PPV interface may be due to the shielding by surface ox ygen impurities, part of which underwent calcium oxide formation at th e interface.