Effect of fullerene on the photogeneration and transport of charge carriers in triphenylamine-containing polyimides

Based on studies of the quantum yield and drift mobility of charge carriers in thin films of fullerene-containing dye-sensitized polyimides performed in wide ranges of electric-field strengths ((1-10) x 10(5) V cm(-1)) and temperatures (77-350 K), a mechanism of the interaction of fullerene molecules with aromatic fragments of polyimides and dye anions is suggested. It was found that fullerene, being an efficient sensitizer of the photoeffect in aromatic triphenylamine-containing polyimides, reduces by more than an order of magnitude the photosensitivity and mobility of charge carriers in dye-sensitized polyimides, restoring these parameters to values typical of unsensitized polyimides. (C) 2002 MAIK "Nauka / Interperiodica".