Quintet multiexciton dynamics in singlet fission
Abstract
Singlet fission, in which two triplet excitons are generated from a single absorbed photon, is a key third-generation solar cell concept. Conservation of angular momentum requires that singlet fission populates correlated multiexciton states, which can subsequently dissociate to generate free triplets. However, little is known about electronic and spin correlations in these systems since, due to its typically short lifetime, the multiexciton state is challenging to isolate and study. Here, we use bridged pentacene dimers, which undergo intramolecular singlet fission while isolated in solution and in solid matrices, as a unimolecular model system that can trap long-lived multiexciton states. We also combine transient absorption and time-resolved electron spin resonance spectroscopies to show that spin correlations in the multiexciton state persist for hundreds of nanoseconds. Furthermore, we confirm long-standing predictions that singlet fission produces triplet pair states of quintet character. Finally, we compare two different pentacene–bridge–pentacene chromophores, systematically tuning the coupling between the pentacenes to understand how differences in molecular structure affect the population and dissociation of multiexciton quintet states.
- Authors:
-
[1];
[3];
- Univ. of New South Wales, Sydney, NSW (Australia). School of Photovoltaic and Renewable Energy Engineering
- Columbia Univ., New York, NY (United States). Dept. of Chemistry
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
- Univ. of New South Wales, Sydney, NSW (Australia). School of Physics
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1394748
- Report Number(s):
- BNL-114013-2017-JA
Journal ID: ISSN 1745-2473; KC0403020; TRN: US1702595
- Grant/Contract Number:
- SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Physics
- Additional Journal Information:
- Journal Volume: 13; Journal Issue: 2; Journal ID: ISSN 1745-2473
- Publisher:
- Nature Publishing Group (NPG)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; chemical physics; electronic properties and materials; molecular electronics
Citation Formats
Tayebjee, Murad J. Y., Sanders, Samuel N., Kumarasamy, Elango, Campos, Luis M., Sfeir, Matthew Y., and McCamey, Dane R. Quintet multiexciton dynamics in singlet fission. United States: N. p., 2016.
Web. doi:10.1038/NPHYS3909.
Tayebjee, Murad J. Y., Sanders, Samuel N., Kumarasamy, Elango, Campos, Luis M., Sfeir, Matthew Y., & McCamey, Dane R. Quintet multiexciton dynamics in singlet fission. United States. https://doi.org/10.1038/NPHYS3909
Tayebjee, Murad J. Y., Sanders, Samuel N., Kumarasamy, Elango, Campos, Luis M., Sfeir, Matthew Y., and McCamey, Dane R. Mon .
"Quintet multiexciton dynamics in singlet fission". United States. https://doi.org/10.1038/NPHYS3909. https://www.osti.gov/servlets/purl/1394748.
@article{osti_1394748,
title = {Quintet multiexciton dynamics in singlet fission},
author = {Tayebjee, Murad J. Y. and Sanders, Samuel N. and Kumarasamy, Elango and Campos, Luis M. and Sfeir, Matthew Y. and McCamey, Dane R.},
abstractNote = {Singlet fission, in which two triplet excitons are generated from a single absorbed photon, is a key third-generation solar cell concept. Conservation of angular momentum requires that singlet fission populates correlated multiexciton states, which can subsequently dissociate to generate free triplets. However, little is known about electronic and spin correlations in these systems since, due to its typically short lifetime, the multiexciton state is challenging to isolate and study. Here, we use bridged pentacene dimers, which undergo intramolecular singlet fission while isolated in solution and in solid matrices, as a unimolecular model system that can trap long-lived multiexciton states. We also combine transient absorption and time-resolved electron spin resonance spectroscopies to show that spin correlations in the multiexciton state persist for hundreds of nanoseconds. Furthermore, we confirm long-standing predictions that singlet fission produces triplet pair states of quintet character. Finally, we compare two different pentacene–bridge–pentacene chromophores, systematically tuning the coupling between the pentacenes to understand how differences in molecular structure affect the population and dissociation of multiexciton quintet states.},
doi = {10.1038/NPHYS3909},
journal = {Nature Physics},
number = 2,
volume = 13,
place = {United States},
year = {Mon Oct 17 00:00:00 EDT 2016},
month = {Mon Oct 17 00:00:00 EDT 2016}
}
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Figure 1: Molecular structure and Jablonski diagram of the singlet fission system. a, Bipentacenes, BPn, with n = 2 and 3 p-phenylene linkers b, After photoexcitation, SF generates a (TT) pair state, which eventually dissociates via a conformational transition to yield isolated triplets. c, Schematic representation of the low fieldmore »
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