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- W3187079778 abstract "Efficient energy transport is desirable in organic semiconductor (OSC) devices. However, photogenerated excitons in OSC films mostly occupy highly localized states, limiting exciton diffusion coefficients to below ~10-2 cm2/s and diffusion lengths below ~50 nm. We use ultrafast optical microscopy and nonadiabatic molecular dynamics simulations to study well-ordered poly(3-hexylthiophene) nanofiber films prepared using living crystallization-driven self-assembly, and reveal a highly efficient energy transport regime: transient exciton delocalization, where energy exchange with vibrational modes allows excitons to temporarily re-access spatially extended states under equilibrium conditions. We show that this enables exciton diffusion constants up to 1.1 ± 0.1 cm2/s and diffusion lengths of 300 ± 50 nm. Our results reveal the dynamic interplay between localized and delocalized exciton configurations at equilibrium conditions, calling for a re-evaluation of exciton dynamics and suggesting design rules to engineer efficient energy transport in OSC device architectures not based on restrictive bulk heterojunctions." @default.
- W3187079778 created "2021-08-16" @default.
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- W3187079778 date "2021-08-06" @default.
- W3187079778 modified "2023-10-14" @default.
- W3187079778 title "Efficient energy transport in an organic semiconductor mediated by transient exciton delocalization" @default.
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- W3187079778 doi "https://doi.org/10.1126/sciadv.abh4232" @default.
- W3187079778 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8336960" @default.
- W3187079778 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34348902" @default.
- W3187079778 hasPublicationYear "2021" @default.
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