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Magnetic dipolar interaction between correlated triplets created by singlet fission in tetracene crystals

Author

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  • Rui Wang

    (National Laboratory of Solid State Microstructures, School of Physics, Nanjing University)

  • Chunfeng Zhang

    (National Laboratory of Solid State Microstructures, School of Physics, Nanjing University
    Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China)

  • Bo Zhang

    (National Laboratory of Solid State Microstructures, School of Physics, Nanjing University
    Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China)

  • Yunlong Liu

    (National Laboratory of Solid State Microstructures, School of Physics, Nanjing University
    Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China)

  • Xiaoyong Wang

    (National Laboratory of Solid State Microstructures, School of Physics, Nanjing University
    Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Min Xiao

    (National Laboratory of Solid State Microstructures, School of Physics, Nanjing University
    Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China
    University of Arkansas)

Abstract

Singlet fission can potentially break the Shockley–Queisser efficiency limit in single-junction solar cells by splitting one photoexcited singlet exciton (S1) into two triplets (2T1) in organic semiconductors. A dark multiexciton state has been proposed as the intermediate connecting S1 to 2T1. However, the exact nature of this multiexciton state, especially how the doubly excited triplets interact, remains elusive. Here we report a quantitative study on the magnetic dipolar interaction between singlet-fission-induced correlated triplets in tetracene crystals by monitoring quantum beats relevant to the multiexciton sublevels at room temperature. The resonances of multiexciton sublevels approached by tuning an external magnetic field are observed to be avoided, which agrees well with the theoretical predictions considering a magnetic dipolar interaction of ∼0.008 GHz. Our work quantifies the magnetic dipolar interaction in certain organic materials and marks an important step towards understanding the underlying physics of the multiexciton state in singlet fission.

Suggested Citation

  • Rui Wang & Chunfeng Zhang & Bo Zhang & Yunlong Liu & Xiaoyong Wang & Min Xiao, 2015. "Magnetic dipolar interaction between correlated triplets created by singlet fission in tetracene crystals," Nature Communications, Nature, vol. 6(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9602
    DOI: 10.1038/ncomms9602
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