# Manifestation of T-Exciton Migration in the Kinetics of Singlet Fission in Organic Semiconductors

Source: [Manifestation of T-Exciton Migration in the Kinetics of Singlet Fission in Organic Semiconductors](<https://www.sota2.com/research/paper/68fa35b71e209131ce8a3ca8>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T21:24:36.654Z

Authors: A. I. Shushin

Published: 2017-02-28T08:24:38.000Z

## Abstract

Kinetics of singlet fission in organic semiconductors, in which the excited singlet state (S\_1) spontaneously splits into a pair of triplet (T) excitons, is known to be strongly influenced by back geminate annihilation of TT-pairs. We show that this influence can be properly described only by taking into account the diffusive exciton migration. The migration effect is treated in the model of two kinetically coupled states: the intermediate state of interacting TT-pairs and the state of migrating excitons. Within this model the singlet fission (including magnetic field effects) is studied as applied to the fluorescence decay kinetics (FDK) I\_{S\_1}(t) for S\_1-state. The analysis shows that migration strongly affects the FDK resulting, in particular, in the universal long-time dependence I\_{S\_1}(t) \\sim t^{-3/2}. The model accurately describes the FDK, recently observed for a number of systems. Possible applications of the considered model to the analysis of mechanisms of migration, using experimentally measured FDK, are briefly discussed.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1702.08688>)

[PDF](<https://arxiv.org/pdf/1702.08688.pdf>)