Author/Authors :
Ruseckas، نويسنده , , Arvydas and Theander، نويسنده , , Mathias and Andersson، نويسنده , , Mats G. E. Svensson، نويسنده , , Mattias and Prato، نويسنده , , Maurizio and Inganنs، نويسنده , , Olle and Sundstrِm، نويسنده , , Villy، نويسنده ,
Abstract :
Photoexcitation dynamics in films of polythiophenes with different side groups were studied by transient absorption spectroscopy using 80 fs pulses. We show that inter-chain charge pairs (CP) are generated with ∼20% efficiency in a polymer with short inter-chain distance (∼4 Å) within 100 fs after photoexcitation. We discuss two mechanisms for inter-chain charge separation: (i) electron or hole transfer from an initially excited intra-chain singlet state or (ii) optical excitation of mixed exciton–charge transfer states, which quickly evolve to inter-chain CPs.
