Revealing the Singlet Fission Mechanism for a Silane-Bridged Thienotetracene Dimer

Liang-Chun Lin, Ryan Dill, Karl Thorley, Sean Parkin, John Anthony, Justin Johnson, Niels Damrauer

Research output: Contribution to journalArticlepeer-review


Tetraceno[2,3-b]thiophene is regarded as a strong candidate for singlet fission-based solar cell applications due to its mixed characteristics of tetracene and pentacene that balance exothermicity and triplet energy. An electronically weakly coupled tetraceno[2,3-b]thiophene dimer (Et2Si(TIPSTT)2) with a single silicon atom bridge has been synthesized, providing a new platform to investigate the singlet fission mechanism involving the two acene chromophores. We study the excited state dynamics of Et2Si(TIPSTT)2 by monitoring the evolution of multiexciton coupled triplet states, 1TT to 5TT to 3TT to T1 + S0, upon photoexcitation with transient absorption, temperature-dependent transient absorption, and transient/pulsed electron paramagnetic resonance spectroscopies. We find that the photoexcited singlet lifetime is 107 ps, with 90% evolving to form the TT state, and the complicated evolution between the multiexciton states is unraveled, which can be an important reference for future efforts toward tetraceno[2,3-b]thiophene-based singlet fission solar cells.
Original languageAmerican English
Pages (from-to)3982-3992
Number of pages11
JournalJournal of Physical Chemistry A
Issue number20
StatePublished - 2024

NREL Publication Number

  • NREL/JA-5900-89098


  • aromatic compounds
  • chromophores
  • hydrocarbons
  • oligomers
  • quantum mechanics


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