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Singlet Fission in 9,10-Bis(phenylethynyl)anthracene thin films

Bae, Youn Jue, Kang, Gyeongwon, Malliakas, Christos D., Nelson, Jordan N., Zhou, Jiawang, Young, Ryan M., Wu, Yi-Lin, Van Duyne, Richard P., Schatz, George C. and Wasielewski, Michael R. 2018. Singlet Fission in 9,10-Bis(phenylethynyl)anthracene thin films. Journal of the American Chemical Society 140 (45) , pp. 15140-15144. 10.1021/jacs.8b07498

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Abstract

Singlet fission (SF) in two or more electronically coupled organic chromophores converts a high-energy singlet exciton into two low-energy triplet excitons, which can be used to increase solar cell efficiency. Many known SF chromophores are unsuitable for device applications due to chemical instability and low triplet state energies. The results described here show that efficient SF occurs in polycrystalline thin films of 9,10-bis(phenylethynyl)anthracene (BPEA), a commercial dye that has singlet and triplet energies of 2.40 and 1.11 eV, respectively, in the solid state. BPEA crystallizes into two polymorphs with space groups C2/c and Pbcn, which undergo SF with kSFA = (109 ± 4 ps)−1 and kSFB = (490 ± 10 ps)−1, respectively. The high triplet energy and efficient SF evidenced from the 180 ± 20% triplet yield make BPEA a promising candidate for enhancing solar cell performance.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: American Chemical Society
ISSN: 0002-7863
Date of First Compliant Deposit: 7 February 2019
Date of Acceptance: 29 October 2018
Last Modified: 05 Jun 2020 12:45
URI: http://orca.cf.ac.uk/id/eprint/119304

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