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Title: Origins of Singlet Fission in Solid Pentacene from an ab initio Green’s Function Approach

Journal Article · · Physical Review Letters
 [1];  [1];  [1];  [1]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

We develop a new first-principles approach to predict and understand rates of singlet fission with an ab initio Green's-function formalism based on many-body perturbation theory. Starting with singlet and triplet excitons computed from a GW plus Bethe-Salpeter equation approach, we calculate the exciton--bi-exciton coupling to lowest order in the Coulomb interaction, assuming a final state consisting of two non-interacting spin-correlated triplets with finite center-of-mass momentum. For crystalline pentacene, symmetries dictate that the only purely Coulombic fission decay from a bright singlet state requires a final state consisting of two inequivalent nearly degenerate triplets of nonzero, equal and opposite, center-of-mass momenta. For such a process, we predict a singlet lifetime of 40 to 150 fs, in very good agreement with experimental data, indicating that this process can dominate singlet fission in crystalline pentacene. As a result, our approach is general and provides a framework for predicting and understanding multiexciton interactions in solids.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1544345
Alternate ID(s):
OSTI ID: 1414884
Journal Information:
Physical Review Letters, Vol. 119, Issue 26; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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  • Progress in Photovoltaics: Research and Applications, Vol. 10, Issue 6 https://doi.org/10.1002/pip.452
journal January 2002
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Morphology Effectively Controls Singlet-Triplet Exciton Relaxation and Charge Transport in Organic Semiconductors text January 2009
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Momentum dependence of the excitons in pentacene text January 2012
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Microscopic theory of singlet exciton fission. II. Application to pentacene dimers and the role of superexchange text January 2012
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Structural and excited-state properties of oligoacene crystals from first principles text January 2016
Gaussian-based coupled-cluster theory for the ground state and band structure of solids preprint January 2017
Vibronic exciton theory of singlet fission. I. Linear absorption and the anatomy of the correlated triplet pair state text January 2017
Vibronic exciton theory of singlet fission. II. Two-dimensional spectroscopic detection of the correlated triplet pair state text January 2017

Cited By (10)

Polarized absorbance and Davydov splitting in bulk and thin-film pentacene polymorphs journal January 2018
Quantum cutting using organic molecules journal January 2019
Singlet fission molecules among known compounds: finding a few needles in a haystack journal January 2019
On the possibility of singlet fission in crystalline quaterrylene journal May 2018
Vibronic exciton theory of singlet fission. III. How vibronic coupling and thermodynamics promote rapid triplet generation in pentacene crystals journal June 2018
Time dependent correlations of entangled states with nondegenerate branches and possible experimental realization using singlet fission journal September 2019
Lessons from intramolecular singlet fission with covalently bound chromophores journal January 2020
Variational Excitations in Real Solids: Optical Gaps and Insights into Many-Body Perturbation Theory journal July 2019
On the Possibility of Singlet Fission in Crystalline Quaterrylene text January 2017
Vibronic exciton theory of singlet fission. III. How vibronic coupling and thermodynamics promote rapid triplet generation in pentacene crystals text January 2018

Figures / Tables (3)


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