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Interchain effects in the ultrafast photophysics of a semiconducting polymer:THztime-domain spectroscopy of thin films and isolated chains in solution
2005
Physical Review B
We compare the generation and decay dynamics of charges and excitons in a model polymer semiconductor ͑MEH-PPV͒ in solution and drop-cast thin films, by recording the sub-ps transient complex conductivity using THz time-domain spectroscopy. The results show that the quantum efficiency of charge generation is two orders of magnitude smaller in solution ͑ϳ10 −5 ͒ than in the solid film ͑ϳ10 −3 ͒. The proximity of neighboring chains in the films apparently facilitates ͑hot͒ exciton dissociation,
doi:10.1103/physrevb.71.125201
fatcat:62e5wsfi3zhfhauowoj6jznaju