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- W2909408367 abstract "In conjugated polymers used in photovoltaics, charges may be produced on ultrafast time scales without requiring exciton diffusion to a donor–acceptor interface. To investigate the role of high-energy, delocalized exciton states in charge generation within polymer domains, we apply a pump–push–probe transient absorption technique to pristine poly(3-hexylthiophene) nanoparticles. The near-infrared push pulse induces exciton dissociation through the S3 ← S1 electronic transition, which is predicted to show intramolecular charge-transfer character. We suggest that the spatial extent of the high-energy exciton, which induces electron–hole separation, is sufficient to overcome the intrinsic Coulombic attraction of the electron–hole pair. We observe that ∼10% of the pushed excitons undergo dissociation to form free charges. The kinetics of charge recombination indicate that the electron and hole are separated by a distance of ∼3 nm across the polymer domains." @default.
- W2909408367 created "2019-01-25" @default.
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- W2909408367 date "2019-01-17" @default.
- W2909408367 modified "2023-10-17" @default.
- W2909408367 title "Liberation of Charge Carriers by Optical Pumping Excitons in Poly(3-hexylthiophene) Aggregates" @default.
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- W2909408367 doi "https://doi.org/10.1021/acs.jpcc.9b00318" @default.
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