Browsing by Author "Molinie, P"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Degradation of the electrical properties of chlorine-doped poly(seleno-p-arylen diamine)s
    (1996) MHarzi, H; Safoula, G; Conan, A; Bernede, JC; Diaz, F; Godoy, A; Molinie, P; Spiesser, M
    The changes in the conductivity of chlorine-doped poly(seleno-p-arylen diamine)s have been studied with temperature, storage time and ambient atmosphere, The samples have also been studied using X-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR). The conductivity of the polymers with carbonyl in their backbone decreases with storage time but is insensitive to oxygen, The decrease in conductivity with time is attributed to the breaking of the Se-N bonds by chlorine attack, which induces polymer degradation as shown by XPS. The conductivity of the polymers without carbonyl in their backbone was increased by oxygen. This increase can be attributed to oxidation of these polymers and to bipolaron formation as shown by ESR measurements. (C) 1996 Elsevier Science Limited
  • Thumbnail Image
    Item
    Evaporated thin films of insulating poly-(tetrabromo-p-phenylenediselenide)
    (PERGAMON-ELSEVIER SCIENCE LTD, 2002) D'Almeida, K; Bernede, JC; Godoy, A; Diaz, FR; Mevellec, JY; Molinie, P
    It has been shown that thin insulating film at the interface transparent conductive oxide/organic electroluminescent film could improve the performance of organic electroluminescent diodes (OLED). Such insulating film can be inorganic or organic. Poly-(tetrabromo-p-phenylenediselenide) (FBrPDSe) has been proved to be an efficient insulating film in OLED. The properties of these evaporated PBrPDSe thin films have been systematically studied by IR absorption, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, electron spin resonance and optical transmission measurements. It is shown that, when the deposition temperature is kept below the decomposition temperature of the polymer, tetrabromo-p-phenylenediselenide molecule is preserved during the deposition process. However the polymer, which is insoluble in powder form, becomes soluble after deposition. It can be concluded that films are mainly composed of oligomers of tetrabromo-p-phenylenediselenide.