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Type: Journal article
Title: Optical pumping of poly(3-hexylthiophene) singlet excitons induces charge carrier generation
Author: Tapping, P.
Kee, T.
Citation: Journal of Physical Chemistry Letters, 2014; 5(6):1040-1047
Publisher: American Chemical Society
Issue Date: 2014
ISSN: 1948-7185
Organisation: Institute for Photonics & Advanced Sensing (IPAS)
Statement of
Patrick C. Tapping and Tak W. Kee
Abstract: The 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%.
Keywords: P3HT
pump−push−probe spectroscopy
transient absorption
torsional relaxation
Rights: © 2014 American Chemical Society
DOI: 10.1021/jz500217f
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