Abstract

The photogeneration quantum yield and dynamics of charge carriers and excitons in thin films of neat regioregular poly(3-hexylthiophene) (P3HT) and blends with [6,6]-phenyl-C(61)-butyric acid methyl ester (PCBM) were studied with ultrafast optical pump-probe spectroscopy. In neat P3HT the quantum yield for direct photogeneration of charge carriers amounts to 0.15 per absorbed photon. The remaining fraction of absorbed photons leads to formation of excitons. Recombination of charges reduces the quantum yield to about 25% of its initial value on a time scale of 100 ps followed by decay to a no longer observable yield after Ins. Addition of 50% PCBM by weight leads to ultrafast (

Keywords

ExcitonQuantum yieldPhotoluminescenceCharge carrierQuantum efficiencyMaterials scienceUltrafast laser spectroscopyChemistrySpectroscopyAnalytical Chemistry (journal)Molecular physicsOptoelectronicsFluorescenceCondensed matter physicsOpticsPhysicsOrganic chemistry

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Publication Info

Year
2009
Type
article
Volume
113
Issue
32
Pages
14500-14506
Citations
334
Access
Closed

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Jorge Piris, Tieneke E. Dykstra, Artem A. Bakulin et al. (2009). Photogeneration and Ultrafast Dynamics of Excitons and Charges in P3HT/PCBM Blends. The Journal of Physical Chemistry C , 113 (32) , 14500-14506. https://doi.org/10.1021/jp904229q

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DOI
10.1021/jp904229q