Fullerenes enhance the photoconductivity of photoconductive
polymers. This paper studies the mechansim
of enhancement both experimentally and theoretically. The effects
of fullerene doping on the spectroscopic,
charge generation, and charge transport properties of the polymer are
reported. Electrical field effects and
magnetic field effects are examined. On the basis of these data a
charge generation mechansim involving a
singlet of weak charge-transfer complex is proposed for fullerene-doped
N-poly(vinylcarbazole). A new
theoretical model combining both the Onsager and Marcus theory is
developed to quantitatively account for
the field-dependent charge generation efficiency in nonpolar
medium.
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