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https://hdl.handle.net/2440/118283
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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 1932-7455 |
Statement of Responsibility: | 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 |
Grant ID: | http://purl.org/au-research/grants/arc/LE0989747 http://purl.org/au-research/grants/arc/DP160103797 |
Published version: | http://dx.doi.org/10.1021/acs.jpcc.9b00318 |
Appears in Collections: | Aurora harvest 3 Chemical Engineering publications |
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