Efficient free triplet generation follows singlet fission in diketopyrrolopyrrole polymorphs with goldilocks coupling

Andrew M. Levine, Guiying He, Guanhong Bu, Pablo Ramos, Fanglue Wu, Aisha Soliman, Jacqueline Serrano, Dorian Pietraru, Christopher Chan, James D. Batteas, Marta Kowalczyk, Seogjoo J. Jang, Brent L. Nannenga, Matthew Y. Sfeir, Esther H.R. Tsai, Adam B. Braunschweig

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Microcrystal electron diffraction, grazing incidence wide-angle scattering, and UV-vis spectroscopy were used to determine the unit-cell structure and the relative composition of dimethylated diketopyrrolopyrrole H- and J-polymorphs within thin films subjected to vapor solvent annealing (VSA) for different times. The electronic structure and excited-state deactivation pathways of the different polymorphs were examined by transient absorption spectroscopy, conductive probe atomic force microscopy, and molecular modeling. We find that VSA initially converts amorphous films into mixtures of H- and J-polymorphs and promotes further conversion from H to J with longer VSA times. Though both polymorphs exhibit efficient SF to form coupled triplets, free triplet yields are higher in J-polymorph films compared to mixed films because coupling in J-aggregates is lower and, in turn, more favorable for triplet decoupling.

Original languageEnglish (US)
Pages (from-to)12207-12213
Number of pages7
JournalJournal of Physical Chemistry C
Volume125
Issue number22
DOIs
StatePublished - Jun 10 2021
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Fingerprint

Dive into the research topics of 'Efficient free triplet generation follows singlet fission in diketopyrrolopyrrole polymorphs with goldilocks coupling'. Together they form a unique fingerprint.

Cite this