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dc.contributor.authorTapping, P.en
dc.contributor.authorKee, T.en
dc.identifier.citationJournal of Physical Chemistry Letters, 2014; 5(6):1040-1047en
dc.description.abstractThe dynamics of high-energy excitons of poly(3-hexylthiophene) (P3HT) are shown to consist of torsional relaxation and exciton dissociation to form free carriers. In this work, we use pump–push–probe femtosecond transient absorption spectroscopy to study the highly excited states of P3HT in solution. P3HT excitons are generated using a pump pulse (400 nm) and allowed to relax to the lowest-lying excited state before re-excitation using a push pulse (900 or 1200 nm), producing high-energy excitons that decay back to the original excited state with both subpicosecond (0.16 ps) and picosecond (2.4 ps) time constants. These dynamics are consistent with P3HT torsional relaxation, with the 0.16 ps time constant assigned to ultrafast inertial torsional relaxation. Additionally, the signal exhibits an incomplete recovery, indicating dissociation of high-energy excitons to form charge carriers due to excitation by the push pulse. Our analysis indicates that charge carriers are formed with a yield of 11%.en
dc.description.statementofresponsibilityPatrick C. Tapping and Tak W. Keeen
dc.publisherAmerican Chemical Societyen
dc.rights© 2014 American Chemical Societyen
dc.subjectP3HT; pump−push−probe spectroscopy; transient absorption; torsional relaxation; polaronen
dc.titleOptical pumping of poly(3-hexylthiophene) singlet excitons induces charge carrier generationen
dc.typeJournal articleen
dc.contributor.organisationInstitute for Photonics & Advanced Sensing (IPAS)en
pubs.library.collectionIPAS publicationsen
dc.identifier.orcidTapping, P. [0000-0002-2359-1304]en
dc.identifier.orcidKee, T. [0000-0002-4907-4663]en
Appears in Collections:IPAS publications

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