Large exciton diffusion coefficients in two-dimensional covalent organic frameworks with different domain sizes revealed by ultrafast exciton dynamics

Nathan C. Flanders, Matthew S. Kirschner, Pyosang Kim, Thomas J. Fauvell, Austin M. Evans, Waleed Helweh, Austin P. Spencer, Richard D. Schaller, William R. Dichtel, Lin X. Chen

Research output: Contribution to journalArticle

Abstract

Large singlet exciton diffusion lengths are a hallmark of high performance in organic-based devices such as photovoltaics, chemical sensors, and photodetectors. In this study, exciton dynamics of a two-dimensional covalent organic framework, 2D COF-5, is investigated using ultrafast spectroscopic techniques. After photoexcitation, the COF-5 exciton decays via three pathways: (1) excimer formation (4 ± 2 ps), (2) excimer relaxation (160 ± 40 ps), and (3) excimer decay (>3 ns). Excitation fluence-dependent transient absorption studies suggest that COF-5 has a relatively large diffusion coefficient (0.08 cm2/s). Furthermore, exciton-exciton annihilation processes are characterized as a function of COF-5 crystallite domain size in four different samples, which reveal domain-size-dependent exciton diffusion kinetics. These results reveal that exciton diffusion in COF-5 is constrained by its crystalline domain size. These insights indicate the outstanding promise of delocalized excitonic processes available in 2D COFs, which motivate their continued design and implementation into optoelectronic devices.

Original languageEnglish
Pages (from-to)14957-14965
Number of pages9
JournalJournal of the American Chemical Society
Volume142
Issue number35
DOIs
Publication statusPublished - Sep 2 2020

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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    Flanders, N. C., Kirschner, M. S., Kim, P., Fauvell, T. J., Evans, A. M., Helweh, W., Spencer, A. P., Schaller, R. D., Dichtel, W. R., & Chen, L. X. (2020). Large exciton diffusion coefficients in two-dimensional covalent organic frameworks with different domain sizes revealed by ultrafast exciton dynamics. Journal of the American Chemical Society, 142(35), 14957-14965. https://doi.org/10.1021/jacs.0c05404