Polaron Pairs as Intermediate States in the Process of Photogeneration of Free Charge Carriers in Semiconducting Polymers

Properties of polaron pairs (PP) are considered. PP are intermediate states between electron excited state of molecules and free charge carriers in conducting polymers of the PPV type. PP are shown to be important for generation of the free charge carriers at photoexcitation of polymers; recombination of free charge carriers; intra-chain triplet exciton generation; delayed luminescence of mono- and bimolecular nature; displacement current in the transient photoconductivity experiments; spin-dependent reactions.