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Type: Journal article
Title: Liberation of charge carriers by optical pumping excitons in poly(3-hexylthiophene) aggregates
Author: Tapping, P.C.
Roseli, R.B.
Kee, T.W.
Citation: The Journal of Physical Chemistry C: Energy Conversion and Storage, Optical and Electronic Devices, Interfaces, Nanomaterials, and Hard Matter, 2019; 123(6):3441-3448
Publisher: American Chemical Society
Issue Date: 2019
ISSN: 1932-7447
Statement of
Patrick C. Tapping , Ras Baizureen Roseli and Tak W. Kee
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.
Rights: © 2019 American Chemical Society
DOI: 10.1021/acs.jpcc.9b00318
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Chemical Engineering publications

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