Time-Resolved EPR Study on Singlet-Fission Induced Quintet Generation and Subsequent Triplet Dissociation in TIPS-Phenyl-Tetracene Aggregates

The singlet fission (SF) is expected to be powerful tool for exceeding the theoretical limit of the power conversion efficiency on the organic solar cells. However, little is known on the intermolecular SF mechanism in the solid state. In the present study, we have investigated intermolecular SF in...

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Bibliographic Details
Published in:Journal of Photopolymer Science and Technology 2018/06/25, Vol.31(2), pp.163-167
Main Authors: Nagashima, Hiroki, Kawaoka, Shuhei, Matsui, Yasunori, Tachikawa, Takashi, Ikeda, Hiroshi, Kobori, Yasuhiro
Format: Article
Language:English
Subjects:
Couplings
Dichloromethane
Electron paramagnetic resonance
Energy conversion efficiency
EPR
Excited quintet
Fission
Morphology
Organic chemistry
Organic photovoltaics
Photovoltaic cells
Singlet fission
Solar cells
Triplet dissociation
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Summary:The singlet fission (SF) is expected to be powerful tool for exceeding the theoretical limit of the power conversion efficiency on the organic solar cells. However, little is known on the intermolecular SF mechanism in the solid state. In the present study, we have investigated intermolecular SF in 2-phenyl-6,11-bis(triisopropylsilylethynyl)tetracene (TIPS-Ph-Tc) in frozen solutions using a time-resolved electron paramagnetic resonance measurement at a low temperature. SF-born quintet states (Q) and subsequent dissociations into two triplet states (T + T) were detected for a diluted solute concentration of 10-4 M in dichloromethane. The microsecond triplet dissociation was found to occur due to the amorphous morphology in the frozen aggregate, suggesting that Q is generated as a trapped state. Furthermore, it was also suggested that the T + T dissociation follows the Q generation due to a T-T repulsion, whose energy were determined by the negative exchange couplings in the triplet pairs, (TT).
ISSN:0914-9244
1349-6336
DOI:10.2494/photopolymer.31.163