Abstract
Two mechanisms of formation of polaron pairs at photoexcitation of organic polymeric semiconductors are considered. The first one consists in charge-transfer process from excited singlet precursor and the second assumes formation of polaron pairs at recombination of free charge carriers, which are generated first. Model of population of polaron pairs is critical for estimation of recombination rates of the pairs on the basis of experimental data. Picosecond time-resolved experiments performed by the two-correlated-pulses technique are considered, which are in favor of the first model. Consideration is given to the problem of intra-chain triplet exciton formation at geminate recombination of triplet polaron pairs in a DC magnetic field taking into account a dependence of the annihilation rate on the population of magnetic sublevels of excitons. Recombination rates of polaron pairs obtained in the frameworks of two models are compared giving opposite relation between the rates for singlet and triplet polaron pairs.
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