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- W4287029078 abstract "Frenkel excitons are the primary photoexcitations in organic semiconductors and are ultimately responsible for the optical properties of such materials. They are also predicted to form emph{bound} exciton pairs, termed biexcitons, which are consequential intermediates in a wide range of photophysical processes. Generally, we think of bound states as arising from an attractive interaction. However, here we report on our recent theoretical analysis predicting the formation of stable biexciton states in a conjugated polymer material arising from both attractive and repulsive interactions. We show that in J-aggregate systems, JJ-biexcitons can arise from repulsive dipolar interactions with energies $E_{JJ}> 2E_J$ while in H-aggregates, HH-biexciton states $E_{HH} < 2E_H$ corresponding to attractive dipole exciton/exciton interactions. These predictions are corroborated by using ultrafast double-quantum coherence spectroscopy on a PBTTT material that exhibits both J- and H-like excitonic behavior." @default.
- W4287029078 created "2022-07-25" @default.
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- W4287029078 date "2021-08-03" @default.
- W4287029078 modified "2023-09-27" @default.
- W4287029078 title "Concerning the stability of hybrid biexcitons in organic polymer aggregates" @default.
- W4287029078 doi "https://doi.org/10.48550/arxiv.2108.01618" @default.
- W4287029078 hasPublicationYear "2021" @default.
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