PHOTOGENERATION OF CHARGE-CARRIERS IN POL YMERS

Mechanisms of the photogeneration of free charge carriers in polymers are discussed. The photogeneration proceeds via a transition state of bonded ion pairs, which are formed due to the interband excitation or excited autoionization. Free charge carriers are formed by dissociatio n of these pairs in an external electrical field, which process can be described in terms of the Onsager's theory of pair recombination. The photogeneration quantum yield may be increased by doping with electro n accepters.