Interchain and intrachain triplets in poly(3-thienylene vinylene) derivatives

Evan Lafalce; Xiaomei Jiang; Logan P. Sanow; Cheng Zhang

doi:10.1117/1.JPE.8.038001

7 August 2018 Interchain and intrachain triplets in poly(3-thienylene vinylene) derivatives

Evan Lafalce, Xiaomei Jiang, Logan P. Sanow, Cheng Zhang

Author Affiliations +

Journal of Photonics for Energy, Vol. 8, Issue 3, 038001 (August 2018). https://doi.org/10.1117/1.JPE.8.038001

Abstract

We are reporting the optical study of two types of poly (3-thienylene vinylene) (PTV) derivatives with linear and bulk side chain configurations. The first one, poly(3-dodecylthienylenevinylene) with controlled regioregularity (PTV-CR) with an alkyl side group, showed a high degree of crystallinity, whereas the second one, imide-PTV with an electron deficient imide side group, is amorphous. Continuous wave-photoinduced absorption revealed different features of the long-lived triplet absorptions, with the geminately generated triplet–triplet pair in imide-PTV bearing more intrachain characteristics with fast recombination kinetics (<10 μs). On the other hand, the isolated triplet in PTV-CR generated by intersystem crossing had more interchain characteristics with slow recombination kinetics (ms). The decay of the triplet–triplet pair in imide-PTV is monomolecular even at a high pump intensity of 240 mW/cm², whereas the isolated triplets in PTV-CR recombine bimolecularly at a very low pump intensity of 10 mW/cm². Grazing incidence X-ray diffraction, doping induced absorption, and various dependences of the photoinduced absorption spectrum have corroborated the finding that reduced interchain interaction favors the formation of a correlated triplet–triplet pair, a precursor to two independent triplets formed via fission.

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Evan Lafalce, Xiaomei Jiang, Logan P. Sanow, and Cheng Zhang "Interchain and intrachain triplets in poly(3-thienylene vinylene) derivatives," Journal of Photonics for Energy 8(3), 038001 (7 August 2018). https://doi.org/10.1117/1.JPE.8.038001

Received: 1 March 2018; Accepted: 5 July 2018; Published: 7 August 2018

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KEYWORDS

Polymers

Absorption

Polarons

Picosecond phenomena

Doping

Polymer thin films

Excitons

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