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Enhancing Singlet Fission Dynamics by Suppressing Destructive Interference between Charge-Transfer Pathways.

Maria A Castellanos1,2, Pengfei Huo1

  • 1Department of Chemistry, University of Rochester , 120 Trustee Road, Rochester, New York 14627, United States.

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|May 19, 2017
PubMed
Summary
This summary is machine-generated.

We explored charge-transfer (CT) mediated singlet fission dynamics in pentacene dimers. Our findings reveal two key mechanisms to suppress destructive interference and enhance singlet fission efficiency.

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Area of Science:

  • Quantum dynamics
  • Materials science
  • Photochemistry

Background:

  • Singlet fission (SF) is a process where one high-energy exciton splits into two lower-energy excitons.
  • Charge-transfer (CT) states play a crucial role in mediating SF, but their dynamics can be complex.
  • Understanding and controlling SF is vital for developing advanced photovoltaic materials.

Purpose of the Study:

  • To investigate the quantum dynamics of CT-mediated SF in a model pentacene dimer.
  • To identify mechanisms that suppress destructive interference between different SF pathways.
  • To provide design principles for enhancing SF efficiency.

Main Methods:

  • Real-time path-integral approach to simulate quantum dynamics.
  • Analysis of fission dynamics across various reaction regimes, reorganization energies, and temperatures.
  • Investigation of the role of electronic coupling and intermolecular vibrations.

Main Results:

  • The path-integral method accurately models SF dynamics under diverse conditions.
  • Two mechanisms were identified to suppress destructive interference: increasing the energy gap of CT states and utilizing intermolecular vibrations.
  • These mechanisms can enhance the singlet fission rate by up to three times.

Conclusions:

  • CT-mediated SF dynamics can be effectively controlled by manipulating CT state energy gaps and exploiting vibrational effects.
  • Suppression of destructive interference is key to achieving highly efficient singlet fission.
  • The identified design principles offer a pathway toward developing next-generation singlet fission materials for improved solar energy conversion.