# Spin-dependent electron-hole capture kinetics in conjugated polymers

Source: [Spin-dependent electron-hole capture kinetics in conjugated polymers](<https://www.sota2.com/research/paper/68fa25b02c2a3760193b2d39>)

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

Data updated: 2025-10-24T10:54:26.960Z

Authors: Stoyan Karabunarliev, Eric. R. Bittner

Published: 2002-06-26T03:44:00.000Z

## Abstract

The recombination of electron-hole pairs injected in extended conjugated systems is modeled as a multi-pathway vibron-driven relaxation in monoexcited state-space. The computed triplet-to-singlet ratio of exciton formation times $r = \\tau\_T/\\tau\_S$ increases from 0.9 for a model dimer to 2.5 for a 32-unit chain, in excellent agreement with experiments. Therewith we rationalize recombination efficiency in terms of spin-dependent interstate vibronic coupling and spin- and conjugation-length-dependent exciton binding energies.Our model calculations for various length polymers indicate that the ratio of the singlet to triplet formation ratios, $r = \\sigma\_S/\\sigma\_T$, is inversely related to the ratio of the singlet and triplet binding energies, $\\epsilon^b\_S/\\epsilon^b\_T$.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/cond-mat/0206499>)

[PDF](<https://arxiv.org/pdf/cond-mat/0206499.pdf>)