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Related Experiment Video

Updated: May 5, 2026

Single-Molecule Förster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1

Single-Molecule Förster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1

Published on: September 18, 2019

Singlet exciton fission in solution.

Brian J Walker¹, Andrew J Musser, David Beljonne

¹Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, UK.

Nature Chemistry

|November 22, 2013

Summary

This summary is machine-generated.

Singlet exciton fission efficiently generates two triplet states from one singlet state using TIPS-pentacene. This process, observed in solutions, offers a pathway to overcome solar cell efficiency limits.

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Area of Science:

Materials Science
Photochemistry
Renewable Energy

Background:

Singlet exciton fission (SEF) is a process that converts one high-energy singlet exciton into two lower-energy triplet excitons.
SEF has the potential to significantly increase the efficiency of single-junction solar cells, surpassing the Shockley-Queisser limit.
The precise mechanism of SEF, particularly the role of molecular arrangement and intermolecular coupling, remains incompletely understood.

Purpose of the Study:

To investigate the efficiency and mechanism of singlet exciton fission in solutions of bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene).
To explore the potential of TIPS-pentacene as a model system for developing advanced singlet fission materials.
To understand the role of transient intermediates in facilitating efficient singlet fission.

Main Methods:

Photophysical studies of TIPS-pentacene solutions.
Transient absorption spectroscopy to monitor excited-state dynamics.
Analysis of triplet yield and formation rates.

Main Results:

Achieved a triplet yield of 200%, indicating efficient singlet exciton fission.
Observed triplet formation rates close to the diffusion limit.
Identified a transient bound excimer intermediate formed by the collision of excited and ground-state TIPS-pentacene molecules.
Demonstrated that this intermediate dissociates into two triplet excitons.

Conclusions:

TIPS-pentacene solutions exhibit highly efficient singlet exciton fission.
The identified excimer intermediate plays a crucial role in the fission process.
This system serves as a valuable model for designing future singlet fission materials and understanding excited-state cascades in disordered systems for solar energy conversion.