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Femtosecond dynamics of excitons and hole-polarons in composite P3HT/PCBM nanoparticles

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dc.contributor.authorClafton, S.
dc.contributor.authorHuang, D.
dc.contributor.authorMassey, W.
dc.contributor.authorKee, T.
dc.date.issued2013
dc.description.abstractThe dynamics of charge separation in aqueous suspensions of regioregular P3HT nanoparticles containing PCBM were investigated for the first time using femtosecond transient absorption spectroscopy. This investigation is supported by the recently reported use of regioregular P3HT/PCBM nanoparticles as charge trapping and storage devices. In this study, the presence of excited-state and charge-separated species, including singlet excitons, polymer polarons and free charges, generated in rr-P3HT/PCBM nanoparticles was identified through visible pump and visible/near-infrared probe femtosecond transient absorption spectroscopy at a range of electron acceptor concentrations. The decrease of the singlet exciton lifetime by charge transfer to PCBM is well described by a one-dimensional diffusion model with a P3HT domain size of approximately 5 nm for 5-50 wt % PCBM. This model also indicates that bimolecular recombination is the dominant charge recombination mechanism at 20 wt % PCBM and above.
dc.description.statementofresponsibilityScott N. Clafton, David M. Huang, William R. Massey, and Tak W. Kee
dc.identifier.citationJournal of Physical Chemistry B, 2013; 117(16):4626-4633
dc.identifier.doi10.1021/jp308876z
dc.identifier.issn1520-6106
dc.identifier.issn1520-5207
dc.identifier.orcidHuang, D. [0000-0003-2048-4500]
dc.identifier.orcidKee, T. [0000-0002-4907-4663]
dc.identifier.urihttp://hdl.handle.net/2440/78431
dc.language.isoen
dc.publisherAmer Chemical Soc
dc.relation.granthttp://purl.org/au-research/grants/arc/LE0989747
dc.relation.granthttp://purl.org/au-research/grants/arc/LE0989747
dc.rightsCopyright © 2013 American Chemical Society
dc.source.urihttps://doi.org/10.1021/jp308876z
dc.subjectFullerenes
dc.subjectThiophenes
dc.subjectSpectrophotometry, Ultraviolet
dc.subjectDiffusion
dc.subjectParticle Size
dc.subjectTime Factors
dc.subjectNanoparticles
dc.titleFemtosecond dynamics of excitons and hole-polarons in composite P3HT/PCBM nanoparticles
dc.typeJournal article
pubs.publication-statusPublished

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