Solution-Processable, Solid State Donor-Acceptor Materials for Singlet Fission

Masoomi-Godarzi, S, Liu, M, Tachibana, Y, Goerigk, L, Ghiggino, K, Smith, A and Jones, D 2018, 'Solution-Processable, Solid State Donor-Acceptor Materials for Singlet Fission', Advanced Energy Materials, vol. 8, no. 30, pp. 1-15.

Document type: Journal Article
Collection: Journal Articles

Title Solution-Processable, Solid State Donor-Acceptor Materials for Singlet Fission
Author(s) Masoomi-Godarzi, S
Liu, M
Tachibana, Y
Goerigk, L
Ghiggino, K
Smith, A
Jones, D
Year 2018
Journal name Advanced Energy Materials
Volume number 8
Issue number 30
Start page 1
End page 15
Total pages 15
Publisher Wiley-VCH Verlag
Abstract The exploitation of singlet fission (SF) materials in optoelectronic devices is restricted by the limited number of SF materials available and developing new organic materials that undergo singlet fission is a significant challenge. Using a new strategy based on conjugating strong donor and acceptor building blocks, the small molecule (BDT(DPP)2) and polymer (p-BDT-DPP) systems are designed and synthesized knowing that bisthiophene-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (DPP) has a low lying triplet energy level, which is further confirmed by time-dependent density functional theory (TD-DFT) calculations. TD-DFT and natural transition orbital (NTO) analysis are conducted to gain insight into the photophysical properties and features of excited states in BDT(DPP)2, respectively. Femtosecond and nanosecond transient absorption spectroscopies are used to investigate the excited state kinetics in the synthesized compounds. Fast formation of triplet pairs in thin film of p-BDT-DPP and BDT(DPP)2 and the equilibrium formation of correlated triplet pairs and S1 from triplet�triplet annihilation in solution of BDT(DPP)2 are further evidence of SF in these compounds. The short triplet lifetime, as a result of fast biexcitonic recombination, provides additional support for triplet pair formation through singlet fission.
Subject Chemical Thermodynamics and Energetics
Functional Materials
Keyword(s) intramolecular singlet fission
organic photovoltaics
singlet fission
DOI - identifier 10.1002/aenm.201801720
Copyright notice © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN 1614-6832
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