Frenkel biexcitons in hybrid HJ photophysical aggregates

Elizabeth Gutiérrez-Meza, Ravyn Malatesta, Hongmo Li, Ilaria Bargigia, Ajay Ram Srimath Kandada, David A. Valverde-Chávez, Seong Min Kim, Hao Li, Natalie Stingelin, Sergei Tretiak, Eric R. Bittner, Carlos Silva-Acuña

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4 Citations (Scopus)


Frenkel excitons are unequivocally responsible for the optical properties of organic semiconductors and are predicted to form bound exciton pairs (biexcitons). These are key intermediates, ubiquitous in many photophysical processes such as the exciton bimolecular annihilation dynamics in such systems. Because of their spectral ambiguity, there has been, to date, only scant direct evidence of bound biexcitons. By using nonlinear coherent spectroscopy, we identify here bound biexcitons in a model polymeric semiconductor. We find, unexpectedly, that excitons with interchain vibronic dispersion reveal intrachain biexciton correlations and vice versa. Moreover, using a Frenkel exciton model, we relate the biexciton binding energy to molecular parameters quantified by quantum chemistry, including the magnitude and sign of the exciton-exciton interaction the intersite hopping energies. Therefore, our work promises general insights into the many-body electronic structure in polymeric semiconductors and beyond, e.g., other excitonic systems such as organic semiconductor crystals, molecular aggregates, photosynthetic light-harvesting complexes, or DNA.

Original languageEnglish
Article numbereabi5197
JournalScience Advances
Issue number50
Publication statusPublished - Dec 2021
Externally publishedYes


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